Crossword Genius

With plenty of spaces, parking twice in fun? (5)

Ross

I believe the answer is:

gappy

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'with plenty of spaces' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'parking twice in fun?' is the wordplay.
'parking twice' means two substitutions for 'parking'.
'parking' becomes 'p' (abbreviation on road signs).
'parking' becomes 'p' (abbreviation on road signs).
'in' is an insertion indicator.
'fun?' becomes 'gay' (I can't justify this - if you can you should give a lot more credence to this answer).
'p'+'p'='pp'
'pp' put into 'gay' is 'GAPPY'.

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I've seen this clue in The Independent.
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