Crossword Genius

Former lover knocks one leg, creating swelling (9)

Ross

I believe the answer is:

expansion

'swelling' is the definition.
(thesaurus)

'former lover knocks one leg' is the wordplay.
'former lover' becomes 'ex' (an ex-lover).
'knocks' becomes 'pans' (I've seen this in another clue).
'one' becomes 'i' (Roman numeral).
'leg' becomes 'on' (cricket term, fielding positions).
'ex'+'pans'+'i'+'on'='EXPANSION'

'creating' is the link.

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

I've seen this clue in The Telegraph.
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