Crossword Genius

When temperature is hot, bull becomes thin (5)

Ross

I believe the answer is:

sheer

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'thin' is the definition.
(similar in meaning)

I cannot understand how the remainder of the clue works.

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(Other definitions for sheer that I've seen before include "Absolute - precipitous" , "needing to change a course" , "Nothing other than" , "Unqualified" , "Very thin and fine" .)

I've seen this clue in The Hindu.
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