Crossword Genius

Said what diner did, a curvy figure (5)

Ross

I believe the answer is:

eight

'a curvy figure' is the definition.
(visually curvy number)

'said what diner did' is the wordplay.
'said' indicates a 'sounds like' (homophone) clue.
'what diner did' becomes 'ate' (a diner eats food).
'ate' sounds like 'EIGHT'.

(Other definitions for eight that I've seen before include "Perfect cube" , "4x2" , "Pints in gallon" , "Number for rowers" , "Number in a Boat Race crew" .)

I've seen this clue in The Guardian.
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