Crossword Genius

Direct hit for a speculator (4)

Ross

I believe the answer is:

bull

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'for a speculator' is the definition.
(I've seen this in other clues)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for bull that I've seen before include "Bovine charger?" , "Cow's mate" , "fifty on board" , "Tripe" , "Papal edict - nonsense" .)

I've seen this clue in The Mirror.
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