Disapproval concerning strength of spirit (7)
I believe the answer is:
reproof
'disapproval' is the definition.
(I know that reproof is a type of criticism)
'concerning strength of spirit' is the wordplay.
'concerning' becomes 're' (both can mean on a particular topic).
'strength of spirit' becomes 'proof' (I've seen this before).
're'+'proof'='REPROOF'
(Other definitions for reproof that I've seen before include "Reprimand" , "Blaming" , "Once more get water-resistant" , "blame" , "Censure" .)