Crossword Genius

A number having scoffed audibly (5)

Ross

I believe the answer is:

eight

'a number' is the definition.
(I know that eight is a type of digit)

'scoffed audibly' is the wordplay.
'scoffed' becomes 'ate' ('to scoff' is to eat).
'audibly' indicates a 'sounds like' (homophone) clue.
'ate' sounds like 'EIGHT'.

'having' is the link.

(Other definitions for eight that I've seen before include "Chaps having row" , "Hit, e.g. (anag.)" , "One over this for drunkenness" , "power of two" , "Pints in gallon" .)

I've seen this clue in The Daily Express.
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