Tramp lodged in waste pipe (4)
I believe the answer is:
step
'tramp' is the definition.
(to tramp is to step heavily)
'lodged in waste pipe' is the wordplay.
'lodged in' indicates the answer is hidden within the clue (some letters lodged or located in the clue).
'STEP' can be found hidden inside 'waste pipe'.
(Other definitions for step that I've seen before include "Put foot on a pest" , "Prefix meaning related by remarriage" , "Set foot down on pest" , "Action of the leg" , "Stair" .)