Restless French film director turned up during a shot (7)
I believe the answer is:
agitato
'restless' is the definition.
(I've seen this before)
'french film director turned up during a shot' is the wordplay.
'french film director' becomes 'Tati' (Jacques Tati, g907-g98o).
'turned up' says the letters should be written in reverse.
'during' means one lot of letters goes inside another.
'shot' becomes 'go' (both can mean an attempt).
'tati' backwards is 'itat'.
'a'+'go'='ago'
'itat' put into 'ago' is 'AGITATO'.
(Other definitions for agitato that I've seen before include "in tense manner" , "Musical indication; a go at it (anagram)" , "Restlessly (mus.)" , "stirring music" , "Restless and wild (music)" .)