Odd tailless cat causing commotion (6)
I believe the answer is:
rumpus
'commotion' is the definition.
('rumpus' can be a synonym of 'commotion')
'odd tailless cat' is the wordplay.
'odd' becomes 'rum' (I've seen this before).
'tailless' means to remove the last letter.
'cat' becomes 'puss' (puss is a kind of cat).
'puss' with its last letter taken off is 'pus'.
'rum'+'pus'='RUMPUS'
'causing' is the link.
(Other definitions for rumpus that I've seen before include "Noisy brawl" , "'Commotion, din (6)'" , "Making a fuss" , "Row" , "Uproar or angry dispute" .)