Turning up with mother's cats (5)
I believe the answer is:
pumas
'cats' is the definition.
(puma is a kind of cat)
'turning up with mother's' is the wordplay.
'turning' says the letters should be written backwards.
'with' is a charade indicator (letters next to each other).
'mother's' becomes 'ma's' (ma can mean mother).
'up' in reverse letter order is 'pu'.
'pu'+'mas'='PUMAS'
(Other definitions for pumas that I've seen before include "American wild cats" , "Big cats" , "North American mountain lions" , "Large American felines" , "Big felines" .)