Crossword Genius

Brood, having dropped daughter off back of light motorcycle (4)

Ross

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" .)

I've seen this clue in The Times.
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