Moved quickly and removed unwanted green growth (6,3)

I believe the answer is:

nipped out

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'unwanted green growth' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'moved quickly and removed' is the wordplay.
'moved quickly' becomes 'nipped' (I can't explain this - if you can you should give a lot more credence to this answer).
'and' says to put letters next to each other.
'removed' becomes 'out' (taken out).
'nipped'+'out'='NIPPED OUT'

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I've seen this clue in The Irish Times.

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