Most magnanimous popular gestures, at heart (7)

I believe the answer is:

largest

'most magnanimous' is the definition.
('large' can be a synonym of 'magnanimous')

'popular gestures at heart' is the wordplay.
'at heart' indicates the answer is hidden within the clue (letters hidden in the heart of the clue).
'LARGEST' is hidden within 'popular gestures'.

(Other definitions for largest that I've seen before include "Biggest" , "Greatest in size" , "Of greatest magnitude" , "Chief" , "Superlatively extensive" .)

I've seen this clue in The Telegraph.

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