Run off playfully, having taken hat from holidaymaker, maybe (6)
I believe the answer is:
camper
'run' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for camper that I've seen before include "One with temporary home" , "Vehicle for living in" , "One using tent" , "Overnight van" , "Holiday vehicle" .)