Crossword Genius

Number with clever sound (7)

Ross

I believe the answer is:

tenable

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

'number with clever' is the wordplay.
'number' becomes 'ten' (ten is a kind of whole number).
'with' is a charade indicator (letters next to each other).
'clever' becomes 'able' (I've seen this before).
'ten'+'able'='TENABLE'

(Other definitions for tenable that I've seen before include "Able to be believed" , "okay as regards defence" , "Well-founded" , "Viable" , "Based on sound reasoning or evidence" .)

I've seen this clue in The Telegraph.
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