A pair I left for a month (5)

I believe the answer is:

april

'for a month' is the definition.
(April is an example)

'a pair i left' is the wordplay.
'pair' becomes 'pr' (abbreviation).
'left' becomes 'l' (common abbreviation).
'a'+'pr'+'i'+'l'='APRIL'

(Other definitions for april that I've seen before include "days on end" , "'All in an ... evening' (Katharine Tynan)" , "Girl" , "Start of the financial year" , "Part of spring" .)

I've seen this clue in The Daily Express.

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