Terribly wet journalist gets material (5)
I believe the answer is:
Here is my best explanation:
'material' is the definition.
(tweed is a kind of material)
'terribly wet journalist' is the wordplay.
'terribly' indicates an anagram.
'journalist' becomes 'ed' (short for editor**).
'wet' anagrammed gives 'twe'.
'gets' is the link.
(Other definitions for tweed that I've seen before include "See 7", "River on border between England and Scotland", "Flow", "flows across a border", "Twilled cloth", "rough stuff", "Rough material", "Woollen material", "Flower on border" and "woollen material".)