Frighten quarry, perhaps, getting ferret out (9)
I believe the answer is:
determine
'ferret out' is the definition.
(thesaurus)
'frighten quarry' is the wordplay.
'frighten' becomes 'deter' (I can't justify this - if you can you should give a lot more credence to this answer).
'quarry' becomes 'mine' (type of mine).
'deter'+'mine'='DETERMINE'
'perhaps getting' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for determine that I've seen before include "Ascertain by gathering facts" , "I'm entered, so find our precisely" , "Decide - to settle" , "Choose" , "Come to a decision" .)