Dig and mark a grave outside (6)
I believe the answer is:
admire
'dig' is the definition.
(I've seen this before)
'mark a grave outside' is the wordplay.
'mark' becomes 'm'.
'grave' becomes 'dire' (I've seen this in another clue).
'outside' indicates putting letters inside (some letters go outside others).
'a'+'dire'='adire'
'm' inserted into 'adire' is 'ADMIRE'.
'and' acts as a link.
(Other definitions for admire that I've seen before include "Respect greatly" , "Have a high opinion of" , "Revere" , "Have respect for, esteem" , "Esteem. value" .)