Crossword Genius

How long most rulers are given? (4)

Ross

I believe the answer is:

foot

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

This clue could be a double definition.

'how long most rulers are' is the first definition.
The definition and answer can be both quantities as well as being singular nouns.
Maybe you can see a link between them that I can't see?

'given?' is the second definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

Can you help me to learn more?

(Other definitions for foot that I've seen before include "Metrical unit; pay (a bill)" , "Twelve inches" , "Measure - part of body" , "Imperial distance" , "Unit of length" .)

I've seen this clue in The Sun.
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