To sceptics of astrology, it's simply bull (6)

I believe the answer is:

taurus

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

'bull' is the definition.
(I know that bull can be written as Taurus)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for taurus that I've seen before include "Bull constellation" , "Second sign of the zodiac, the Bull" , "house" , "Mountains in 8 across" , "Sign of the Bull from 12 across" .)

I've seen this clue in the Evening Standard.

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