Restrict a trick (5)
I believe the answer is:
stunt
I believe this clue is a double definition.
'restrict' is the first definition.
(thesaurus)
'a trick' is the second definition.
(I've seen this in another clue)
(Other definitions for stunt that I've seen before include "Difficult (usually dangerous) feat" , "Inhibit - exploit" , "Impede growth" , "Exhibitionistic performance" , "Check the growth of (something)" .)