Musicians carefully inspect disc (5)
I believe the answer is:
combo
'musicians' is the definition.
(I've seen this before)
'carefully inspect disc' is the wordplay.
'carefully inspect' becomes 'comb' (I can't justify this - if you can you should give a lot more credence to this answer).
'disc' becomes 'O' (disc-shaped letter).
'comb'+'o'='COMBO'
Can you help me to learn more?
(Other definitions for combo that I've seen before include "musicians" , "Small jazz group" , "group of players" , "Small (jazz or rock) band" , "Small jazz or dance band" .)