A pair one left for over four weeks (5)

I believe the answer is:

april

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'for over four weeks' is the definition.
I can't tell whether this definition defines the answer.

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

Can you help me to learn more?

(Other definitions for april that I've seen before include "Spring month" , "Start of the financial year" , "Start of the second quarter" , "Reputedly showery month" , "Girl" .)

I've seen this clue in The Times.

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