Crossword Genius

Make an effort with conservative, withholding nothing (3)

Ross

I believe the answer is:

try

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'make an effort' is the definition.
(to make an effort is to sincerely try)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for try that I've seen before include "crack" , "A rugby score, result of effort" , "Gorse" , "Attempt a score" , "Bid" .)

I've seen this clue in The Irish Times.
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