Uproar as monkey hides duck beneath cape (8)
I believe the answer is:
clangour
'uproar' is the definition.
(I've seen this before)
'monkey hides duck beneath cape' is the wordplay.
'monkey' becomes 'langur' (langur is a kind of monkey**).
'hides' is an insertion indicator.
'duck' becomes 'o'.
'beneath' says to put letters next to each other (in a down clue).
'cape' becomes 'c' (abbreviation used on maps).
'langur' enclosing 'o' is 'langour'.
'langour' put after 'c' is 'CLANGOUR'.
'as' is the link.
(Other definitions for clangour that I've seen before include "Uproar; loud repeated noise" , "Loud ringing noise" , "Commotion" , "Loud resounding noise" .)