Rodents' star turn (4)
I believe the answer is:
rats
'rodents'' is the definition.
(rat is a kind of rodent)
'star turn' is the wordplay.
'turn' says the letters should be written in reverse.
'star' in reverse letter order is 'RATS'.
(Other definitions for rats that I've seen before include "Curse" , "First word of 'The 21 19'" , "Damn" , "Blast" , "Rodent pests" .)