Crossword Genius

Cast initially appearing in whole film (4)

Ross

I believe the answer is:

scum

'film' is the definition.
(scum is a kind of film)

'cast initially appearing in whole' is the wordplay.
'initially' suggests taking the first letters.
'appearing in' indicates putting letters inside.
'whole' becomes 'sum' (sum is a kind of whole).
The first letter of 'cast' is 'c'.
'c' inserted inside 'sum' is 'SCUM'.

(Other definitions for scum that I've seen before include "Floating dirt or froth" , "Fruit of the oak" , "Algae" , "low life" , "Impurities floating on water, or despicable people" .)

I've seen this clue in The Mirror.
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