Zodiacal sign of sheepishness? (3)

I believe the answer is:

ram

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

'zodiacal sign' is the definition.
'ram' can be an answer for 'sign' (Aries the Ram, sign of the zodiac). I'm not certain of the 'zodiacal' bit.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for ram that I've seen before include "Aries is the Sign of the ..." , "Object to batter with" , "Computers need it to operate" , "man with many partners?" , "Male sheep - bash into it" .)

I've seen this clue in the Evening Standard.

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