Swamp drawings by old film star (6)

I believe the answer is:

bogart

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But I can't explain it at all! Could you help me understand?

(Other definitions for bogart that I've seen before include "American actor" , "Humphrey --, US film actor" , "See 12" , "Famous player" , "Rob gat from the old film star" .)

I've seen this clue in the Sydney Morning Herald.

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