Photographic equipment in Deighton's headwear (4,3)
I believe the answer is:
lens cap
'photographic equipment' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'deighton's headwear' is the wordplay.
'deighton's' becomes 'lens' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'headwear' becomes 'cap' (cap is a type of hat).
'lens'+'cap'='LENS CAP'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for lens cap that I've seen before include "Aperture protector" , "Camera cover" , "protection for photographer" .)