Alison confused about tax redemption (9)
I believe the answer is:
salvation
'redemption' is the definition.
('salvation' can be a synonym of 'redemption')
'alison confused about tax' is the wordplay.
'confused' is an anagram indicator.
'about' indicates putting letters inside.
'tax' becomes 'vat' (British sales tax).
'alison' with letters rearranged gives 'salion'.
'salion' placed around 'vat' is 'SALVATION'.
(Other definitions for salvation that I've seen before include "Christian body noted for social work and bands" , "Preservation from evil" , "Deliverance from evil" , "Alias on TV (anag) - Christian's aim?" , "Redemption" .)