Crossword Genius

Stetson for a young bull that's lost its head? (6,3)

Ross

I believe the answer is:

cowboy hat

I'm a little stuck... Click here to teach me more about this clue!

'head?' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.
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