Tears off for look (5)
I believe the answer is:
stare
'for look' is the definition.
(staring is a kind of looking)
'tears off' is the wordplay.
'off' is an anagram indicator.
'tears' with letters rearranged gives 'STARE'.
(Other definitions for stare that I've seen before include "Gaze fixedly" , "Look with fixed gaze" , "Rates (anag.)" , "Look with fixed eyes" , "bird" .)