Perform with a mix of tailless cats (3)
I believe the answer is:
act
'perform' is the definition.
(acting is a kind of performing)
'mix of tailless cats' is the wordplay.
'mix of' indicates an anagram.
'tailless' means to remove the last letter (the tail of the word is removed).
'cats' with its final letter taken away is 'cat'.
'cat' anagrammed gives 'ACT'.
'with a' is the link.
(Other definitions for act that I've seen before include "Assumed attitude" , "Take steps" , "Behave like thespian" , "Accomplishment" , "Bill successfully prosecuted" .)