He may perhaps steal piano and flute (5)
I believe the answer is:
crimp
This clue could be a double definition.
'he may perhaps steal piano' is the first definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'flute' is the second definition.
(I know that flute is a more specific form of crimp)
'and' acts as a link.
Can you help me to learn more?
(Other definitions for crimp that I've seen before include "Compress into small folds or ridges" , "Connect by squeezing together" , "tight lock" , "wave" , "Fold or press into ridges" .)