Ms Britton's office plant? (4)

I believe the answer is:

fern

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'office plant?' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

(Other definitions for fern that I've seen before include "Leafy plant" , "Feathery frondy plant" , "Type of plant" , "Tracheophyte plant" , "Often shady plant" .)

I've seen this clue in The Sun.

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