Wallops (4)
(Other definitions for hits that I've seen before include "The sort of strikes" , "Raps - successful recordings" , "that please the public?" , "Pop successes" , "Top pops" .)
'wallops' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for kos that I've seen before include "Greek island" , "Island of the Dodecanese" , "Aegean island" , "Aegean isle" .)