Take off the charge for tax relief (9)
I believe the answer is:
deduction
'tax relief' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe there's a link between them I don't understand?
'take off the charge' is the wordplay.
'take off' becomes 'deduct' (synonyms).
'the charge' becomes 'ion' (an ion is a charged particle).
'deduct'+'ion'='DEDUCTION'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for deduction that I've seen before include "Taking off" , "What's lost" , "what Holmes made" , "corollary" , "Removal; finding" .)