Rise to be a toff (5)

I believe the answer is:

swell

I believe this clue is a double definition.

'rise' is the first definition.
(thesaurus)

'a toff' is the second definition.
(wealthy or high-class person)

'to be' is the link.

(Other definitions for swell that I've seen before include "part of organ" , "First class" , "Puff up" , "Expand - great!" , "Grow larger; excellent" .)

I've seen this clue in the Evening Standard.

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