Crossword Genius

Husband effectively to provide this plant? (6)

Ross

I believe the answer is:

thrift

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'this plant?' is the definition.
(type of plant)

I cannot understand how the rest of the clue works.

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(Other definitions for thrift that I've seen before include "Care in using money" , "Economical management of money or resources" , "Careful management of money" , "Good husbandry" , "Careful control of resources" .)

I've seen this clue in The Times.
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