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Pictures Crosby and Nash collaborator (6)

Ross

I believe the answer is:

stills

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'pictures' is the definition.
(still is a kind of picture)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for stills that I've seen before include "Alcohol producers" , "Photos taken from a film" .)

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