Check councillor observed outside (6)
I believe the answer is:
screen
'check' is the definition.
(I know that screen is a type of check)
'councillor observed outside' is the wordplay.
'councillor' becomes 'cr' (I've seen this in other clues).
'observed' becomes 'seen' (synonyms).
'outside' indicates putting letters inside.
'cr' put into 'seen' is 'SCREEN'.
(Other definitions for screen that I've seen before include "Cover - cinema" , "Movable partition - cinema" , "Test or examine for the presence of disease or infection" , "A film is projected onto it" , "Broadcast on TV" .)