Crossword Genius

I refuse to lighten up the linear magnitude (6)

Ross

I believe the answer is:

length

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

'magnitude' is the definition.
(length is a kind of magnitude)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for length that I've seen before include "Extent from end to end" , "Measurement from end to end" , "Linear extent" , "stretch" , "End-to-end distance" .)

I've seen this clue in the Sydney Morning Herald.
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