Book about our deceptive barrier causes fuss (8)
I believe the answer is:
brouhaha
'fuss' is the definition.
(I've seen this before)
'book about our deceptive barrier' is the wordplay.
'book' becomes 'b' (abbreviation for book).
'about' is an insertion indicator.
'deceptive' is an anagram indicator.
'barrier' becomes 'haha' (haha is a kind of barrier).
'our' is an anagram of 'rou'.
'b' put within 'rou' is 'brou'.
'brou'+'haha'='BROUHAHA'
'causes' is the link.
(Other definitions for brouhaha that I've seen before include "Sensation" , "Stir" , "Kind of commotion - ends in laughter?" , "Outcry" , "Great fuss" .)