Crossword Genius

Frivolous duke towards the rear (4)

Ross

I believe the answer is:

daft

'frivolous' is the definition.
(both can mean silly)

'duke towards the rear' is the wordplay.
'duke' becomes 'd' (abbreviation).
'towards the rear' becomes 'aft' (I've seen this before).
'd'+'aft'='DAFT'

(Other definitions for daft that I've seen before include "Barmy, crackers" , "'---- as a brush': dotty" , "Potty" , "Stupid" , "Half-witted" .)

I've seen this clue in The Sun.
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