The reasonableness of taking a number with skill (10)

I believe the answer is:

tenability

'the reasonableness' is the definition.
('tenability' can be a synonym of 'reasonableness')

'a number with skill' is the wordplay.
'a number' becomes 'ten' (ten is a number).
'with' says to put letters next to each other.
'skill' becomes 'ability' (I've seen this in another clue).
'ten'+'ability'='TENABILITY'

'of taking' acts as a link.

I've seen this clue in The Irish Independent.

Want a hint initially instead of a full solution? Install my app