Crossword Genius

Sign given by head of militia abandoning tanks (8)

Ross

I believe the answer is:

aquarius

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'sign' is the definition.
(I know that Aquarius is a sign)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for aquarius that I've seen before include "The Water Bearer" , "Sign of the zodiac, the water-bearer" , "A 23 ac" , "Sign of the water-carriers" , "Eleventh sign of the Zodiac" .)

I've seen this clue in The Guardian.
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