Crossword Genius

Inability in volume (10)

Ross

I believe the answer is:

incapacity

'inability' is the definition.
(I know that incapacity is a type of incapability)

'in volume' is the wordplay.
'volume' becomes 'capacity' (capacity is a kind of volume).
'in'+'capacity'='INCAPACITY'

(Other definitions for incapacity that I've seen before include "Disability" , "Lack of required skills" , "Lack of authority" , "Helplessness" , "Lack of power or ability" .)

I've seen this clue in The Irish News.
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