Lays out (4)
(Other definitions for pays that I've seen before include "Imburses" , "stumps up" , "Gives money for work" , "Is profitable, country (Fr.)" , "Gives money (for goods, etc)" .)
'lays out' 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 "Aegean isle" , "Island of the Dodecanese" , "Aegean island" , "Greek island" .)