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Swimmer digested guide (not working) to accommodation. (9)
D-r-i---y.
Dormitory? - don't see why apart from dory for the fish

m[on]itor

Thanks ixion
That gives s-p-r---o for An incredibly powerful character (9).

Also
Computer code instance at theatre (5)
E-r-p - a computer term I have never heard of?

Superhero just a dawned on me!

egrep (eg = instance) + (rep = theatre company) is a term from unix operating system, but this is really very obscure.

For 19A (Queen of Britain, we're told, and her favourite plant (5,4) ) I have ROYAL FERN but if anyone knows why this is the answer or what the answer should be I'd like to know.

Thanks.

Thanks, chantho - obscure indeed.
I also have royal fern but am equally unsure as to why it might be correct

Fern Britton is considered as the "queen" of television by some...Queen = Royal + Fern ?
There is a fern called royal fern
http://dictionary.reference.com/browse/royal-fern

On second thoughts...Queen = royal + Britton we are told (sounds like Britain) Fern (Britton)