Crossword Genius

Pay to get old shots in movie (7)

Ross

I believe the answer is:

footage

I'm a little stuck... Click here to teach me more about this clue!

'shots in movie' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

'pay to get old' is the wordplay.
'pay' becomes 'foot' (as in footing the bill).
'to get old' becomes 'age' (to age is to get older).
'foot'+'age'='FOOTAGE'

Can you help me to learn more?

(Other definitions for footage that I've seen before include "Piece of filmed material" , "Length of film" , "Quantity of film (of event)" , "quantity shot" , "amount of film" .)

I've seen this clue in The Sun.
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