John hides — Avtaar looks (5)
I believe the answer is:
miens
'looks' is the definition.
(mien can mean someone's look or appearance)
'john hides avtaar' is the wordplay.
'john' becomes 'men's' (men's is a kind of john).
'hides' is an insertion indicator.
'avtaar' becomes 'i' (I can't justify this - if you can you should give a lot more credence to this answer).
'mens' placed around 'i' is 'MIENS'.
Can you help me to learn more?
(Other definitions for miens that I've seen before include "Looks, manners" , "Manners in mines" .)