They don't settle (6)
I believe the answer is:
nomads
'they don't settle' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for nomads that I've seen before include "Damson consumed by rovers" , "Itinerants" , "Wandering people, roaming tribes" , "Travellers" , "Damson for wandering tribes" .)