Position young man to welcome French film-maker (7)
I believe the answer is:
station
'position' is the definition.
(station is a kind of position)
'young man to welcome french film-maker' is the wordplay.
'young man' becomes 'son' (male child).
'to welcome' is an insertion indicator (inserted letters are welcomed in).
'french film maker' becomes 'Tati' (actor and filmmaker Jacques Tati).
'son' enclosing 'tati' is 'STATION'.
(Other definitions for station that I've seen before include "Nine across stop" , "Waterloo perhaps" , "Military base; rail stop" , "camp?" , "Building where service is based, fire or train" .)