Crossword Genius

*Tramps harassing chemist or dropout? (7)

Ross

I believe the answer is:

trudges

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

'tramps' is the definition.
(to trudge is to tramp or plod along)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

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