Albumen, say, good with stirred margarine finally

I believe the answer is:

eggwhite

'albumen' is the definition.
(synonyms)

'say good with stirred margarine finally' is the wordplay.
'say' becomes 'eg' (short for 'exempli gratia', 'for example' in Latin).
'good' becomes 'g' (abbreviation).
'stirred' is an anagram indicator.
'finally' says to take the final letters.
The final letter of 'margarine' is 'e'.
'with' is an anagram of 'whit'.
'eg'+'g'+'whit'+'e'='EGG-WHITE'

I've seen this clue in The Daily Mail.

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