Crossword Genius

Ready to explode? Nap in part of chair (7)

Ross

I believe the answer is:

armrest

I'm a little stuck... Click here to teach me more about this clue!

'part of chair' is the definition.
(I've seen this before)

'ready to explode? nap' is the wordplay.
I cannot really understand how this works, but
'nap' could be 'rest' and 'rest' is found within the answer.
The remaining letters 'arm' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'in' acts as a link.

Can you help me to learn more?

(Other definitions for armrest that I've seen before include "Part of a chair - smarter (anag)" , "Part of sofa or chair" , "sort of support is needed" , "giving a member support" , "Padded side to a chair" .)

I've seen this clue in The Telegraph.
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