A filmmaker lined up with one (7)
I believe the answer is:
fellini
'a filmmaker' is the definition.
(I've seen this before)
'lined up with one' is the wordplay.
'lined up' becomes 'fellin' (I can't justify this - if you can you should give a lot more credence to this answer).
'with' says to put letters next to each other.
'one' becomes 'i' (Roman numeral).
'fellin'+'i'='FELLINI'
Can you help me to learn more?
(Other definitions for fellini that I've seen before include "Italian film-maker, d. 1993" , "It. film director (La Dolce Vita)" , "Federico ------- (1920-1993), Italian film director" , "Shooting Italian" , "Federico --, Italian film producer" .)