Crossword Genius

Man having to show zest (5)

Ross

I believe the answer is:

gusto

'zest' is the definition.
(synonyms)

'man having to' is the wordplay.
'man' becomes 'gus' ().
'having' is a charade indicator (letters next to each other).
'gus'+'to'='GUSTO'

'show' acts as a link.

(Other definitions for gusto that I've seen before include "Zest, exuberance" , "Spirit" , "Relish; vigour" , "Vigorous and enthusiastic enjoyment" , "Great enjoyment in doing something" .)

I've seen this clue in The Globe and Mail.
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