Crossword Genius

Spin with monarch in posh car (6)

Ross

I believe the answer is:

roller

'posh car' is the definition.
(abbreviation for Rolls Royce)

'spin with monarch' is the wordplay.
'spin' becomes 'roll'.
'with' is a charade indicator (letters next to each other).
'monarch' becomes 'ER' (abbreviation for Elizabeth Regina, British Queen).
'roll'+'er'='ROLLER'

'in' acts as a link.

(Other definitions for roller that I've seen before include "Rotating cylinder" , "Painting tool" , "Cylinder for curling the hair" , "luxury car?" , "Long heavy wave approaching the shore" .)

I've seen this clue in The Sun.
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