Australian bay for science (6)

I believe the answer is:

botany

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'science' is the definition.
(botany is a kind of science)

I cannot understand how the remainder of the clue works.

(Other definitions for botany that I've seen before include "Plant study" , "Science of plants" , "type of wool" , "The scientific study of plants" , "13 across study" .)

I've seen this clue in The Sun.

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