Rook reflected in binoculars (3)
I believe the answer is:
con
'rook' is the definition.
(I know that rook is a more specific form of con)
'reflected in binoculars' is the wordplay.
'reflected' is a reversal indicator (letters reflected back).
'in' indicates a hidden word.
'noc' is hidden in the letters of 'binoculars'.
'noc' reversed gives 'CON'.
(Other definitions for con that I've seen before include "Diddle" , "Deceive (someone)" , "Swindle or see" , "Swindle; steer" , "Fleece" .)