Crossword Genius

The charitable quarter (5)

Ross

I believe the answer is:

mercy

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'quarter' is the definition.
(thesaurus)

I cannot understand how the remainder of the clue works.

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(Other definitions for mercy that I've seen before include "Compassion or forgiveness" , "'The quality of ... is not strained' (The Merchant of Venice)" , "Forbearance" , "Compassion for the unfortunate" , "Shakespeare 'The quality of . . . . . is not strained'" .)

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