Menial career collecting rubbish Jack disposed of (6)

I believe the answer is:

flunky

'menial' is the definition.
(thesaurus)

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

(Other definitions for flunky that I've seen before include "servant" , "Uniformed footman" , "Liveried footman" .)

I've seen this clue in The Times.

Want a hint initially instead of a full solution? Install my app