Guitar? Aim to play it idly for a time (10)
I believe the answer is:
instrument
'guitar?' is the definition.
(guitar is a kind of instrument)
'aim to play it idly for a time' is the wordplay.
I cannot quite understand how this works, but
'play' could be 'strum' (I've seen this before) and 'strum' is present in the answer.
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for instrument that I've seen before include "Joanna, perhaps" , "legal document" , "power" , "Word puzzle" , "What's needed for 1 [MUSICIAN]" .)