Flustered soldier on time after a wild date (8)
I believe the answer is:
agitated
'flustered' is the definition.
(thesaurus)
'soldier on time after a wild date' is the wordplay.
'soldier' becomes 'GI' (term for US soldier).
'on' means one lot of letters go next to another (in a down clue, letters appear on others).
'time' becomes 't' (abbreviation).
'after' says to put letters next to each other.
'wild' indicates an anagram.
'date' is an anagram of 'ated'.
'gi'+'t' is 'git'.
'git' after 'a' is 'agit'.
'agit'+'ated'='AGITATED'
(Other definitions for agitated that I've seen before include "Het up" , "Upset, disturbed" , "Worked up, flustered" , "Jittery, hyped up" , "Aroused - disturbed" .)