Crossword Genius

Grand rite, perhaps, slowing down (9)

Ross

I believe the answer is:

retarding

'slowing down' is the definition.
('retard' can be a synonym of 'slow down')

'grand rite perhaps' is the wordplay.
'perhaps' is an anagram indicator.
'grand'+'rite'='grandrite'
'grandrite' with letters rearranged gives 'RETARDING'.

(Another definition for retarding that I've seen is " causing delay".)

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