As wit, may seem endlessly puny (3)
I believe the answer is:
pun
'as wit may seem' is the definition.
I can't judge whether this defines the answer.
'endlessly puny' is the wordplay.
'endlessly' means to remove the last letter.
'puny' with its last letter removed is 'PUN'.
Can you help me to learn more?
(Other definitions for pun that I've seen before include "joke" , "A play on words, not really wit" , "Double entendre" , "A play on words - not the height of wit" , "A play on words, may be funny" .)