Crossword Genius

Former lover criticises one on increase in size (9)

Ross

I believe the answer is:

expansion

'increase in size' is the definition.

'former lover criticises one on' is the wordplay.
'former lover' becomes 'ex' (an ex-lover).
'criticises' becomes 'pans' (I've seen this before).
'one' becomes 'i' (Roman numeral).
'ex'+'pans'+'i'+'on'='EXPANSION'

(Other definitions for expansion that I've seen before include "increase in capacity" , "Process of increasing in size, volume etc" , "Enlargement" , "fatter" , "Increase in volume" .)

I've seen this clue in The Sun.
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