Resolved to put off when dug up (10)
I believe the answer is:
determined
'resolved' is the definition.
(determining is a kind of resolving)
'when dug up' is the wordplay.
'when' becomes 'deter' (I can't explain this - if you can you should believe this answer much more).
'dug up' becomes 'mined' (I've seen this in another clue).
'deter'+'mined'='DETERMINED'
'to put off' acts as a link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for determined that I've seen before include "Decided - resolute" , "Found out" , "settled" , "Firmly decided" , "set" .)