Flavouring a mince pie calls for (8)

I believe the answer is:

allspice

I'm a little stuck... Click here to teach me more about this clue!

'flavouring' is the definition.
(allspice is a kind of flavouring)

'a mince pie calls for' is the wordplay.
'pie calls' can be anagrammed to 'ALLSPICE'.
Though, I am not clear how this is indicated.

Can you help me to learn more?

(Other definitions for allspice that I've seen before include "Pill case (anag.)" , "Dried aromatic fruit from the West Indies" , "fragrant plant" , "Aromatic West Indian tree" , "Pimento or Jamaica pepper" .)

I've seen this clue in the Evening Standard.

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