Parking in cover having a lot of small trees (5)

I believe the answer is:

copsy

'having a lot of small trees' is the definition.
(like a copse)

'parking in cover' is the wordplay.
'parking' becomes 'p' (abbreviation on road signs).
'in' means one lot of letters goes inside another.
'cover' becomes 'cosy' (as in a tea cosy).
'p' put into 'cosy' is 'COPSY'.

I've seen this clue in The Times.

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