Gains weight, nominally (7)

I believe the answer is:

winston

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'gains weight nominally' is the definition.
I can't tell whether this definition defines the answer.

'gains weight' is the wordplay.
'gains' becomes 'wins' ('win' can be a synonym of 'gain').
'weight' becomes 'ton' (unit of weight).
'wins'+'ton'='WINSTON'

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(Other definitions for winston that I've seen before include "Prime minister" , "Statesman" , "11 [LAWMAKER]" , "war leader" , "-- Churchill, UK PM" .)

I've seen this clue in the Evening Standard.

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