Clue: What's blazing in zest, purée, etc? (5,7)
Answer: CREPE SUZETTE
Explanation: Definition: What's blazing in zest, purée, etc?
An anagram ('what's blazing'? I think that the choice of anagrind owes more to the &lit meaning than the wordplay) of 'zest purée etc'. Crêpes Suzette (generally in the plural) is a dessert of thin pancakes in a sauce containing orange zest, juice (Escoffier has tangerine zest and juice; purée is close, if not exact) and enough orange liqueur to allow the dessert to be served flambé – set ablaze.