Do your utmost to get variety (6)

I believe the answer is:

strain

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'variety' is the definition.
('strain' can be a synonym of 'variety')

I can't explain the remainder of the clue.

(Other definitions for strain that I've seen before include "Drain off" , "Try too hard" , "Tension and exertion" , "tax" , "Noted" .)

I've seen this clue in the Evening Standard.

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