Crossword Genius

Zealous and sincere -- how he altered in a riot (12)

Ross

I believe the answer is:

wholehearted

'zealous and sincere' is the definition.
(wholehearted means sincerely committed)

'how he altered in a riot' is the wordplay.
'in a riot' is an anagram indicator.
'how'+'he'+'altered'='howhealtered'
'howhealtered' anagrammed gives 'WHOLEHEARTED'.

(Other definitions for wholehearted that I've seen before include "Unqualified" , "Completely sincere and committed" , "Unreserved - affectionate" , "With enthusiastic devotion" , "Earnest" .)

I've seen this clue in The Telegraph.
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