He may well be ginger (3)
I believe the answer is:
tom
'he' is the definition.
(I've seen this in another clue)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for tom that I've seen before include "Boy - cat" , "Jerry's cartoon antagonist" , "Edgar's Poor disguise (Lear)" , "Pig-stealing piper's son" , "Male beast" .)