PR event is crap, encapsulating the very opposite of cool (5,2)
I believe the answer is:
photo op
'pr event' is the definition.
(public relations stunt)
'crap encapsulating the very opposite of cool' is the wordplay.
'crap' becomes 'poop' (both can informally mean excrement).
'encapsulating' indicates putting letters inside (I've seen this in other clues).
'the very opposite of cool' becomes 'hot' (opposite of 'cool').
'poop' going around 'hot' is 'PHOTO OP'.
'is' is the link.
(Other definitions for photo op that I've seen before include "Chance for publicity" , "Chance to shoot" .)