Covering an inclusion in material for printing (6)
I believe the answer is:
canopy
'covering an inclusion' is the definition.
'canopy' can be an answer for 'covering' (I have seen 'Ceremonial covering' mean 'canopy' so perhaps 'covering' could also mean 'canopy'). I'm not sure about the 'an inclusion' bit.
'in material for printing' is the wordplay.
'in' is an insertion indicator.
'material' becomes 'copy' (copy is a kind of material).
'for printing' becomes 'an' (I can't justify this - if you can you should give a lot more credence to this answer).
'copy' going around 'an' is 'CANOPY'.
Can you help me to learn more?
(Other definitions for canopy that I've seen before include "Roof-like shelter" , "Cover above four-poster" , "in the topmost branches" , "Uppermost branches of forest trees" , "Ceremonial covering" .)