19 down
Shrub
and
vegetable
penetrated
by
decay
(6)
Shrub and vegetable penetrated by decay (6)
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The definition is at the beginning of the clue.
How the clue works
The definition is Shrub — PROTEA being a flowering one. Take PEA (vegetable) and have it penetrated by ROT (decay), slotting inside to give P+ROT+EA.