Sullen, touchy (5)
I believe the answer is:
moody
This clue is a double definition.
'sullen' is the first definition.
(synonyms)
'touchy' is the second definition.
(thesaurus)
(Other definitions for moody that I've seen before include "Down in the dumps" , "Liable to sulking" , "Mercurial" , "Temperamental -- capricious" , "American evangelist" .)