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Old film star that Banksy might do in a toilet? (6)

Ross

I believe the answer is:

bogart

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This could be a double definition.

'old' is the first definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'film star that banksy might do in a toilet?' is the second definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

Can you help me to learn more?

(Other definitions for bogart that I've seen before include "See 12" , "Lauren Bacall's first actor husband, d. 1957" , "Famous player" , "Humphrey --, US film actor" , "Rob gat from the old film star" .)

I've seen this clue in The Independent.
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