When excited, hug or kiss thug (9)
I believe the answer is:
roughneck
'thug' is the definition.
(I've seen this before)
'when excited hug or kiss' is the wordplay.
'when excited' is an anagram indicator.
'kiss' becomes 'neck' (I've seen this before).
'hug'+'or'='hugor'
'hugor' is an anagram of 'rough'.
'rough'+'neck'='ROUGHNECK'
(Other definitions for roughneck that I've seen before include "Heavy" , "Thug" , "Oil worker" .)