Maybe feeling no end catty! (6)
I believe the answer is:
feline
'catty' is the definition.
(I've seen this in another clue)
'maybe feeling no end' is the wordplay.
'maybe' indicates anagramming the letters.
'no end' means to remove the last letter.
'feeling' with its final letter taken off is 'feelin'.
'feelin' with letters rearranged gives 'FELINE'.
(Other definitions for feline that I've seen before include "16 [TOM] perhaps" , "Of or like cats" , "Relating to cats" , "(Relating to a) cat" , "An animal of the cat family" .)