Organiser spilling more port (8)
I believe the answer is:
promoter
'organiser' is the definition.
I can't tell whether this definition defines the answer.
'spilling more port' is the wordplay.
'spilling' indicates an anagram.
'more'+'port'='moreport'
'moreport' with letters rearranged gives 'PROMOTER'.
Can you help me to learn more?
(Other definitions for promoter that I've seen before include "One books entertainments" , "Find me in torpor like publicist of product" , "Sponsor" , "Organiser (of a sporting event)" , "One pushing" .)