Film taking hour, for example, about a supermarket nearly breaking record (3,5,6)
I believe the answer is:
the great escape
'film' is the definition.
'hour for example about a supermarket nearly breaking record' is the wordplay.
I cannot quite see how this works, but
'hour' could be 'h' (abbreviation) and 'h' is found within the answer.
'example' could be 'eg' (short for 'exempli gratia', 'for example' in Latin) and 'eg' is found in the answer.
'about' could be 'rea' (I've seen this in other clues) and 'rea' is found within the answer.
'a' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
'taking' acts as a link.
Can you help me to learn more?
(Other definitions for the great escape that I've seen before include "War film" , "picture" .)