Soon, one can take a girl out for nothing (4)

I believe the answer is:

anon

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'soon' is the definition.
(synonyms)

'one can take a girl out for nothing' is the wordplay.
'one' becomes 'an' (an apple is one apple).
'can take' is an insertion indicator.
'a girl out' becomes 'n' (I can't justify this - if you can you should give a lot more credence to this answer).
'for' means one lot of letters go next to another.
'nothing' becomes 'O' (looks like zero - 0).
'n'+'o'='no'
'an' enclosing 'no' is 'ANON'.

Can you help me to learn more?

(Other definitions for anon that I've seen before include "Soon - nobody knows me" , "Soon, shortly (archaic)" , "coming after a call" , "Soon, precious stone" , "Not identified by name" .)

I've seen this clue in the Evening Standard.

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