Carry drink outside for spectator (8)
I believe the answer is:
beholder
'for spectator' is the definition.
(thesaurus)
'carry drink outside' is the wordplay.
'carry' becomes 'hold' (synonyms).
'drink' becomes 'beer' (beer is a kind of drink).
'outside' is an insertion indicator (some letters go outside others).
'hold' put within 'beer' is 'BEHOLDER'.
(Other definitions for beholder that I've seen before include "One who observes" , "Beauty is said to be in this eye" , "person who can see what's going on" , "there's beauty in her eyes" , "Observer" .)