Crossword Genius

Sense there's agreement among a number (8)

Ross

I believe the answer is:

eyesight

'sense' is the definition.
(eyesight is a kind of sense)

'agreement among a number' is the wordplay.
'agreement' becomes 'yes'.
'among' is an insertion indicator.
'a number' becomes 'eight' (eight is a kind of number**).
'yes' inserted within 'eight' is 'EYESIGHT'.

'there's' acts as a link.

(Other definitions for eyesight that I've seen before include "Power of seeing" , "View" , "What's needed to see" , "Visual faculty" , "Requirement to look" .)

I've seen this clue in The Telegraph and The Guardian.
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