Crossword Genius

For one short month, both master and monarch (3)

Ross

I believe the answer is:

mar

I'm a little stuck... Click here to teach me more about this clue!

'for one short month' is the definition.
(short for March; 'short' indicates an abbreviation)

'both master and monarch' is the wordplay.
'both master' becomes 'ma' (Master of Arts. I am not sure about the 'both' bit.).
'and' is a charade indicator (letters next to each other).
'monarch' becomes 'R' (abbreviation for regina, e.g. in ER ).
'ma'+'r'='MAR'

Can you help me to learn more?

(Other definitions for mar that I've seen before include "Blight" , "Damage; month (abbr.)" , "Spoil something" , "when spring growth starts?" , "'Damage, impair (3)'" .)

I've seen this clue in the Evening Standard.
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