Crossword Genius

Become less neat (5)

Ross

I believe the answer is:

lower

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'become' is the definition.
The answer and definition can be both related to change as well as being verbs in their base form.
Perhaps they are linked in a way I don't understand?

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

Can you help me to learn more?

(Other definitions for lower that I've seen before include "where are trousers in relation?" , "Hereford, say" , "Threaten" , "Take down" , "Bring down" .)

I've seen this clue in The Globe and Mail.
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