Crossword Genius

Needing to be done quickly in plant (4)

Ross

I believe the answer is:

rush

I believe this is a double definition.

'needing to be done quickly' is the first definition.
(as in a rush job)

'plant' is the second definition.
(rush is a type of plant)

'in' is the link.

(Other definitions for rush that I've seen before include "Sudden flow of liquid" , "Overcharge" , "Race" , "Lose no time" , "Stampede - water plant" .)

I've seen this clue in The Telegraph.
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