Time, with very large middle, to get XL! (3-5)

I believe the answer is:

two-score

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'get xl' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'time with very large middle' is the wordplay.
'time' becomes 't' (abbreviation).
'with' becomes 'w' (short for with).
'very large' becomes 'os' (abbreviation for oversize).
'middle' becomes 'core' (core can mean the centre of something).
't'+'w'+'os'+'core'='TWO-SCORE'

'to' acts as a link.

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I've seen this clue in The Times.

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