Poet in old film (4)
I believe the answer is:
ovid
'poet' is the definition.
(famous Roman poet)
'old film' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'film' becomes 'vid'.
'o'+'vid'='OVID'
'in' acts as a link.
(Other definitions for ovid that I've seen before include "Metamorphoses author" , "Void for old Roman poet" , "Roman poet exiled by Augustus to Tomi on the Black Sea, where he died, AD 17" , "Roman love poet" , "Roman known for his love poetry" .)