Get to the bottom of jogger's bottom and around sweater's neck (5)

I believe the answer is:

solve

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'get to the bottom of' is the definition.
(I've seen this in another clue)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for solve that I've seen before include "Unravel (a clue)" , "do crosswords" , "Clear up a mystery" , "Find the answer to a puzzle" , "Work out answer to puzzle" .)

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

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