... indispensable for one who is filming (6)
I believe the answer is:
camera
'indispensable for' is the definition.
The definition suggests a singular noun which matches the answer.
'one who is filming' is the wordplay.
I cannot really see how this works, but
'one' could be 'me' (a setter might use 'one' to humourously mean 'me') and 'me' is found within the answer.
The remaining letters 'cara' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for camera that I've seen before include "Picture-taker" , "Brownie, among others" , "Device for taking photographs" , "One never lies" , "Light-proof box with a lens and film" .)