Brood, having dropped daughter off back of light motorcycle (4)
I believe the answer is:
mope
'brood' is the definition.
(I've seen this before)
I cannot understand how the rest of the clue works.
(Other definitions for mope that I've seen before include "Be apathetic or gloomy about poem" , "Pine - sulk" , "Move around slowly and aimlessly" , "Move listlessly and aimlessly" , "Wander round gloomily" .)