9 across
Flowering
plant
with
bacterial
infection’s
left
out
(8)
Flowering plant with bacterial infection’s left out (8)
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The definition is at the beginning of the clue.
How the clue works
Look at Flowering plant — that's your definition. For the wordplay, you take W from with, then LISTERIA (a bacterial infection) with its L dropped (since left's been "left out"), giving you ISTERIA. Stick W in front of that and you've got your answer.