Maiden name on individual grave (6)
I believe the answer is:
solemn
'grave' is the definition.
(I know that grave can be written as solemn)
'maiden name on individual' is the wordplay.
'maiden' becomes 'm' (cricket abbreviation).
'name' becomes 'n' (common abbreviation e.g. on forms).
'on' says to put letters next to each other.
'individual' becomes 'sole' (I've seen this in other clues).
'm'+'n'='mn'
'mn' put after 'sole' is 'SOLEMN'.
(Other definitions for solemn that I've seen before include "Serious and formal" , "Formal, ceremonius" , "Formal, ceremonial" , "Sober and serious" , "pious" .)