leafy heads in a row (8)
I believe the answer is:
cabbages
(Other definitions for cabbages that I've seen before include "Of shoes and ships and ceiling wax,/ of . . . . . . . . and kings (Through the Looking Glass)" , "Members of the Brassica family" , "Brassicas" , "heads for kitchen" , "Begs a cab to get vegetables" .)