Pacific kingdom expelling a Chinese guild (4)
I believe the answer is:
tong
'chinese guild' is the definition.
(I've seen this before)
'pacific kingdom expelling a' is the wordplay.
'pacific kingdom' becomes 'tonga' (I've seen this before).
'expelling' is a deletion indicator.
'tonga' with 'a' removed is 'TONG'.
(Other definitions for tong that I've seen before include "A Chinese association, may be secret" , "Society of criminals" , "could make one's hair curl!" , "Particularly in US manipulate < secret society" , "Chinese criminal gang" .)