Crossword Genius

Has it handlebar horns? (5)

Ross

I believe the answer is:

steer

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'it handlebar horns?' is the definition.
The definition suggests a singular noun which matches the answer.

I cannot understand how the rest of the clue works.

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(Other definitions for steer that I've seen before include "Direct; bullock" , "Guide; bullock" , "beef producer" , "Cattle - guide" , "bovine creature" .)

I've seen this clue in the Evening Standard.
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