Crossword Genius

What can increase power of fantastic horse (12)

Ross

I believe the answer is:

supercharger

'what can increase power' is the definition.
(engine part)

'fantastic horse' is the wordplay.
'fantastic' becomes 'super' (I've seen this before).
'horse' becomes 'charger' (charger is a type of horse).
'super'+'charger'='SUPERCHARGER'

'of' is the link.

(Other definitions for supercharger that I've seen before include "that makes for efficient transport" , "Engine efficiency improver" , "Device improving an engine's efficiency" .)

I've seen this clue in The Times.
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