Crossword Genius

Chuckle when there's a row about a race (6)

Ross

I believe the answer is:

titter

'chuckle' is the definition.
(I've seen this before)

'a row about a race' is the wordplay.
'a row' becomes 'tier' (a tier is a row of things).
'about' indicates putting letters inside.
'a race' becomes 'tt'.
'tier' placed around 'tt' is 'TITTER'.

'when there's' acts as a link.

(Other definitions for titter that I've seen before include "Chuckle" , "Stifled giggle" , "A high-pitched nervous laugh" , "Silly little laugh" , "Half-suppressed laugh" .)

I've seen this clue in the Evening Standard.
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