Bill boards flight in exciting adventure (8)
I believe the answer is:
escapade
'exciting adventure' is the definition.
(I've seen this before)
'bill boards flight' is the wordplay.
'bill' becomes 'ad' (advertisement stuck on wall).
'boards' indicates putting letters inside.
'flight' becomes 'escape' ('escape' can be a synonym of 'flight'**).
'ad' placed within 'escape' is 'ESCAPADE'.
'in' is the link.
(Other definitions for escapade that I've seen before include "Adventurous incident" , "Antic" , "Daring stunt" , "Caper" , "A piece of reckless or mischievous conduct" .)