Large gent tore off glasses (9)
I believe the answer is:
lorgnette
'glasses' is the definition.
(lorgnette is a pair of glasses with a handle)
'large gent tore off' is the wordplay.
'large' becomes 'L' (eg in clothes sizes).
'off' indicates anagramming the letters.
'gent'+'tore'='genttore'
'genttore' anagrammed gives 'orgnette'.
'l'+'orgnette'='LORGNETTE'
(Other definitions for lorgnette that I've seen before include "Handled glasses" , "Pair of spectacles on a stick" , "Eyeglasses with a long handle" , "Handle-mounted glasses" , "Opera glass" .)