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I've struggled to a finish but can't fully see the
parsing of these two!
4 Down - "Injection finally stops pain in tooth"
The answer would appear to be FANG, but how does
FAG relate to "injection", as would appear to be the
case?
41 Across - "Step that would land dancer in
A & E!" "STAIR" appears to be
the correct solution.

41. (A) stair (e)

I also have FANG but cannot parse

Maybe a bit of a fag is a bit of a pain

yes a fag can be a pain

noun
noun: fag; plural noun: fags

1.
informal
a tiring or unwelcome task.
"it's too much of a fag to drive all the way there and back again"
synonyms: chore, slog, grind, drudgery, exertion, trouble, bother, pain, hardship, bore;

"it's too much of a fag to drive all the way there and back again" for example

;0)

...and "n" is the last letter of injection

Thanks, Jazzgirl and Chelle for your help! I'll settle
for that! Should have spotted Fred in there! Happy New Year to you both!

Happy New Year to you too :)