Crossword Genius

One adds zest as Liberal, in showing partiality (10)

Ross

I believe the answer is:

flavouring

'one adds zest' is the definition.
(source of flavour or zest)

'liberal in showing partiality' is the wordplay.
'liberal' becomes 'l' (abbreviation).
'in' means one lot of letters goes inside another.
'showing partiality' becomes 'favouring'.
'l' inserted within 'favouring' is 'FLAVOURING'.

'as' is the link.

I've seen this clue in The Times.
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