Crossword Genius

Served in unit with foolish person (6)

Ross

I believe the answer is:

nitwit

'foolish person' is the definition.
(I've seen this before)

'served in unit with' is the wordplay.
'served' says the answer is hidden in the clue (I've seen 'serving of' mean this).
'NITWIT' is hidden within 'in unit with'.

(Other definitions for nitwit that I've seen before include "Foolish person like funny louse?" , "Birdbrain" , "Informally a stupid person, like funny flea?" , "Twin it with a right eejit" , "Simpleton" .)

I've seen this clue in The Times.
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