Crossword Genius

As used for one's Barnet? (3)

Ross

I believe the answer is:

net

I'm a little stuck... Click here to teach me more about this clue!

'as' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'for one's barnet?' is the wordplay.
'NET' is hidden in amongst the letters.
However, I am unsure how the hidden word is indicated.

'used' acts as a link.

Can you help me to learn more?

(Other definitions for net that I've seen before include "Catch, ensnare" , "Open mesh; catch" , "Open weave fabric" , "Butterfly trap" , "Amount remaining after deductions" .)

I've seen this clue in the Evening Standard.
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