Individual avoiding head, not touching booze left over (4)

I believe the answer is:

nett

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'touching booze left over' is the definition.
I can't judge whether this defines the answer.

'individual avoiding head not' is the wordplay.
'individual' becomes 'net' (I am not sure about this - if you are sure you should believe this answer much more).
'avoiding' indicates named letters should be taken away.
'head' becomes 'nut' (informal term for somebody's head).
'not' becomes 'un' (I've seen this in other clues).
'nut' with 'un' removed is 't'.
'net'+'t'='NETT'

Can you help me to learn more?

(Other definitions for nett that I've seen before include "After taxes" , "Free of tax" , "Left after deductions" , "Opposite of gross" , "Final" .)

I've seen this clue in The Telegraph.

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