Crossword Genius

Spoil a short month (3)

Ross

I believe the answer is:

mar

I believe this is a double definition.

'spoil' is the first definition.
(I know that spoil can be written as mar)

'a short month' is the second definition.
(short for March; 'short' indicates a short form)

(Other definitions for mar that I've seen before include "Ruin" , "Blemish" , "Cause harm" , "Spoil something" , "Oh dear!" .)

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