Pine from lightweight transport with end removed (4)
I believe the answer is:
mope
'pine' is the definition.
(thesaurus)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for mope that I've seen before include "Be mildly depressed" , "Sulk; mooch" , "Be listless and apathetic" , "listless person" , "Moon around" .)