Perhaps watch composition after interval (9)
I believe the answer is:
timepiece
'perhaps watch' is the definition.
(I know that watch is a type of clock)
'composition after interval' is the wordplay.
I cannot really see how this works, but
'composition' could be 'piece' (synonyms) and 'piece' is located in the answer.
'interval' could be 'time' (synonyms) and 'time' is present in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for timepiece that I've seen before include "that sounds the alarm?" , "alarm, perhaps" , "Maybe hunter" , "Eg, watch or clock" , "Watch, say" .)