Zodiac sign whose symbol is said to represent creatures tied together by a rope (6)

I believe the answer is:

pisces

(Other definitions for pisces that I've seen before include "Twelfth sign of the zodiac, the Fish" , "The twelfth sign of the zodiac, the fishes" , "Fish star sign" , "'Sign of the zodiac, the fish (6)'" , "stars" .)

I've seen this clue in The Sunday Times and The Times.

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