The fact that a second (or third etc) dictionary, or even a noted omniscientist, gives a different set of meanings or alternative spellings for a word doesn't mean that the first source is wrong.
Let's say that I want to use one of the words 'nala' and 'nalla' in a puzzle and I've been told that the arbiters will no longer accept "It's in Chambers" as sufficient justification for a particular definition.
Chambers gives both 'nala' and 'nalla' as 'a ravine; a watercourse; a stream or drain'. That's good, but under the new rules we need a VAR check. Thankfully I only need to go as far as the bookcase rather than to Stockley Park.
Consulting the all-knowing OED, I find that 'nala' is given as 'a river or stream; a watercourse, river-bed, ravine', so that looks ok (although it doesn't mention drains), but it doesn't give 'nalla' - there's obviously a Chambers error and I can't use that spelling in my puzzle. I start drafting my email to the editors of the big red book.
The ODE gives 'nala' as 'a watercourse, riverbed, or ravine', so nothing about rivers and streams, but perhaps it is using 'watercourse' in a general sense...it doesn't say, and I don't know how to find out. No sign of 'nalla', so it's clearly no good - I send my plaintive email, laced with the usual obsolete expletives, to Chambers.
Then I see that Collins gives both forms, however only in the sense of 'a ravine'. It must be ok to use 'nalla' (although my definition might have to be 'ravine'). I email a grovelling apology to Chambers. But then I start to think...perhaps Collins pinched the entry from Chambers, and the error has thus been propagated...? I send another mail (sans expletives) asking them to check.
None of the other UK dictionaries says that Chambers is
wrong, either regarding 'nalla' or 'cirrate'. The OED gives 'cirrous' (along with 'cirrose') as meaning 'of or pertaining to cirrus clouds', but Chambers / Collins / ODE don't. So can 'cirrous' be defined in a puzzle by 'cloudy', even if only solvers with access to OED/SOED will be able to check it...?