Climbs up a sign (6)

I believe the answer is:

scales

I believe this is a double definition.

'climbs up' is the first definition.
(scaling is a kind of climbing up)

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

(Other definitions for scales that I've seen before include "a number of small plates" , "Balance - climbs" , "Measuring instrument for weighing" , "Instruments for weighing things" , "Sign of the Zodiac - actor" .)

I've seen this clue in The Everyman puzzle in The Observer.

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