Oliver's plants? (5)

I believe the answer is:

reeds

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'plants?' is the definition.
(reed is a kind of plant)

I don't understand the remainder of the clue.

(Other definitions for reeds that I've seen before include "Tall grasses with hollow stems" , "Thin pieces of cane in musical instruments" , "Music-makers" , "Plants providing thatching material" , "Water plants" .)

I've seen this clue in the Evening Standard.

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