Fuss as strange cat has tail docked (6)
I believe the answer is:
rumpus
'fuss' is the definition.
(thesaurus)
'strange cat has tail docked' is the wordplay.
'strange' becomes 'rum' (similar in meaning).
'cat' becomes 'puss' (puss is a kind of cat).
'has tail docked' means to remove the last letter (the last letter is cut off).
'puss' with its last letter taken off is 'pus'.
'rum'+'pus'='RUMPUS'
'as' is the link.
(Other definitions for rumpus that I've seen before include "'Commotion, din (6)'" , "To-do" , "Noisy brawl" , "Uproar or angry dispute" , "Hullabaloo" .)