Blow struck for an individual right (4)

I believe the answer is:

oner

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'blow struck for an' is the definition.
'oner' can be an answer for 'blow' (I have seen 'Heavy blow ' mean 'oner' so perhaps 'blow' could also mean 'oner'). I'm not sure about the 'struck for an' bit.

'individual right' is the wordplay.
'individual' becomes 'one' (an individual is one person).
'right' becomes 'r' (common abbreviation).
'one'+'r'='ONER'

Can you help me to learn more?

(Other definitions for oner that I've seen before include "something unique" , "Remarkable thing" , "Big lie; unique thing" , "expert" , "A quid" .)

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