Signs of interest to astrologers (6)

I believe the answer is:

zodiac

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

'signs' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

(Other definitions for zodiac that I've seen before include "Group of astrological signs" , "Heavenly area" , "Star sign chart" , "17 Across is a sign of the ......." , "Heavenly band with 12 divisions" .)

I've seen this clue in The Globe and Mail.

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