Crossword Genius

One short day is less than a month (3)

Ross

I believe the answer is:

mon

'one short day' is the definition.
(abbreviation for Monday; 'short' asks for a short form)

'less than a month' is the wordplay.
'less' is a deletion indicator.
'a' becomes 'an'.
'an'+'month'='anmonth'
'anmonth' with 'than' taken away is 'MON'.

'is' is the link.

(Other definitions for mon that I've seen before include "Ynys -- (Anglesey)" , "My resting-place (French)" , "Abbrev. for weekday or colloquial Scots male" .)

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