Small fish served two ways for director (5,3)

I believe the answer is:

spike lee

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'for director' is the definition.
(US film director)

'small fish served two ways' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'fish' becomes 'pike' (pike is a kind of fish).
'served two ways' becomes 'lee' (I can't explain this - if you can you should believe this answer much more).
's'+'pike'+'lee'='SPIKE LEE'

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I've seen this clue in The Guardian.

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