Snigger (6)

I believe the answer is:

titter

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

This is the entire clue.

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

I've seen this clue in the Evening Standard and The Independent.

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