Speculator and powerful man (4)

I believe the answer is:

bull

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

This clue might be a double definition.

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

'powerful man' is the second definition.
'bull' can be an answer for 'man' (bull is a kind of man). I am not certain of the 'powerful' bit.

'and' acts as a link.

Can you help me to learn more?

(Other definitions for bull that I've seen before include "Animal on target?" , "Large quadruped" , "Papal document; farm animal" , "Male bovine - target's centre" , "Bovine charger?" .)

I've seen this clue in The Sun.

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