Camouflaged and in disguise, noticing nothing (9)
I believe the answer is:
incognito
'camouflaged' is the definition.
(I've seen this before)
'in disguise noticing nothing' is the wordplay.
'in disguise' is an anagram indicator.
'nothing' becomes 'o' (looks like zero - 0).
'noticing' with letters rearranged gives 'incognit'.
'incognit'+'o'='INCOGNITO'
'and' acts as a link.
(Other definitions for incognito that I've seen before include "With true identity concealed" , "In disguise" , "as something else" , "as disguised person appears?" , "On the sly" .)