Film-maker in suit attends retrospective (4)
I believe the answer is:
tati
'film-maker' is the definition.
(French director and actor Jacques Tati)
'in suit attends retrospective' is the wordplay.
'in' indicates a hidden word.
'retrospective' shows that the letters should be reversed in order.
'itat' can be found hidden inside 'suit attends'.
'itat' backwards is 'TATI'.
(Other definitions for tati that I've seen before include "Creator of Monsieur Hulot" , "Jacques ___ , French comic actor and film director, d. 1982" , "Jacques -, Fr. comedian" , "Jacques ----, French filmmaker" , "Jacques -- (Monsieur Hulot's Holiday)" .)