An artist may do so in a quiet churchyard (4)
I believe the answer is:
etch
'an artist may do' is the definition.
I can't tell whether this definition defines the answer.
'in a quiet churchyard' is the wordplay.
'in' indicates a hidden word.
'ETCH' can be found hidden inside 'quiet churchyard'.
'so' is the link.
Can you help me to learn more?
(Other definitions for etch that I've seen before include "Make deep lines" , "Engrave (metal, glass etc.)" , "Engrave (metal/glass)" , "Wear away by chemical reaction" , "Carve or engrave into surface" .)