Crossword Genius

Ruler to ascend (5)

Ross

I believe the answer is:

scale

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This could be a double definition.

'ruler' is the first definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'ascend' is the second definition.
(thesaurus)

'to' acts as a link.

Can you help me to learn more?

(Other definitions for scale that I've seen before include "Climb; overlapping plate" , "Tones rising maybe" , "See 23" , "Doh, re, me etc" , "Climb, or series of notes in music" .)

I've seen this clue in The Hindu.
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