Many cats have never cut their whiskers (6)
I believe the answer is:
shaven
'their whiskers' is the definition.
I can't judge whether this definition defines the answer.
'many cats have never cut' is the wordplay.
'many cats' becomes 's' (I can't explain this - if you can you should believe this answer much more).
'never' becomes 'no' (I've seen this in other clues).
'cut' means to remove the last letter.
'no' with its final letter removed is 'n'.
's'+'have'+'n'='SHAVEN'
Can you help me to learn more?
(Other definitions for shaven that I've seen before include "lacking coverage" , "With hair removed (N, not D)" , "Hairless after work with razor" , "without locks" , "Without a beard" .)