The Piper's son (3)
I believe the answer is:
tom
'the piper's son' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tom that I've seen before include "Pig-stealing piper's son" , "Repeated twice, this becomes an African drum" , "Cruise" , "Man's name; male cat" , "Hoyden" .)