Tense, nervous (4)
This clue is a double definition.
'tense' is the first definition.
(similar in meaning)
'nervous' is the second definition.
(synonyms)
(Other definitions for edgy that I've seen before include "Jittery" , "Overstrung" , "Nervous and tense, irritable" , "Nervous; jumpy" , "In a tense state" .)