Crossword Genius

Move in a way that's plumb vertical? (3)

Ross

I believe the answer is:

bob

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

This might be a double definition.

'move in a way' is the first definition.
'bob' can be an answer for 'move' (bobbing is a kind of moving). I am unsure of the 'in a way' bit.

'plumb vertical?' is the second definition.
'bob' can be an answer for 'plumb' (thesaurus). I'm not certain of the 'vertical?' bit.

'that's' acts as a link.

Can you help me to learn more?

(Other definitions for bob that I've seen before include "-- Dylan, singer" , "Old coin for Robert" , "Quick curtsy" , "Bounce" , "Change" .)

I've seen this clue in the Evening Standard.
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