Pacific islander volunteers to strike Scotsman perhaps (8)
I believe the answer is:
tahitian
'pacific islander' is the definition.
(I've seen this in another clue)
'volunteers to strike scotsman perhaps' is the wordplay.
'volunteers' becomes 'TA' (abbreviation for Territorial Army).
'to strike' becomes 'hit' (synonyms).
'scotsman perhaps' becomes 'Ian' (common Scottish name).
'ta'+'hit'+'ian'='TAHITIAN'
(Other definitions for tahitian that I've seen before include "One from Papeete" , "Polynesian islander" , "Native of South Pacific island, capital Papeete" , "It, in a hat (anag)" , "Citizen of Papeete, say" .)