Crossword Genius

A number fit to be considered acceptable (7)

Ross

I believe the answer is:

tenable

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'acceptable' is the definition.
(thesaurus)

'a number fit' is the wordplay.
'a number' becomes 'ten' (ten is a number).
'fit' becomes 'able' (similar in meaning).
'ten'+'able'='TENABLE'

'to be considered' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for tenable that I've seen before include "Able to be held" , "Can be maintained" , "Based on sound reasoning or evidence" , "Possible to be defended" , "Able to be believed" .)

I've seen this clue in the Evening Standard.
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