Crossword Genius

Make use of a key exercise? (5-2)

Ross

I believe the answer is:

press-up

'exercise?' is the definition.
(I know that press-up is a type of arm exercise)

'make use of a key' is the wordplay.
'make' becomes 'press' (pressing is a kind of making).
'use of a key' becomes 'up' (I can't justify this - if you can you should give a lot more credence to this answer).
'press'+'up'='PRESS-UP'

(Other definitions for press-up that I've seen before include "Form of arm exercise" , "Arm exercise while lying face down" , "Face-to-the-floor exercise" , "Keep-fit exercise" , "Gymnastic floor exercise" .)

I've seen this clue in The Times.
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