Widely distributed (6)
'widely distributed' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for far-flung that I've seen before include "Distant, remote" , "Extensive" , "Remote or widespread" .)
(Other definitions for spread that I've seen before include "Special display" , "Parsed (anag.)" , "Soft paste; large meal" , "extended" , "Disseminate through padres" .)