Plant tool for gardener getting quiet leg-over (10)

I believe the answer is:

nipplewort

'plant' is the definition.

'tool for gardener getting quiet leg-over' is the wordplay.
'tool for gardener' becomes 'trowel'.
'getting' says to put letters next to each other.
'quiet' becomes 'p' (music symbol for 'piano').
'leg' becomes 'pin' (pin is a kind of leg).
'over' says the letters should be written in reverse.
'trowel'+'p'+'pin'='trowelppin'
'trowelppin' reversed gives 'NIPPLEWORT'.

I've seen this clue in The Guardian.

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