Warning from victim pierced by arrow perhaps (10)
I believe the answer is:
precursory
'warning' is the definition.
(thesaurus)
'victim pierced by arrow perhaps' is the wordplay.
'victim' becomes 'prey' (prey is a kind of victim).
'pierced by' is an insertion indicator (inserted letters pierce the word).
'arrow perhaps' becomes 'cursor' (I can't explain this - if you can you should give a lot more credence to this answer).
'prey' enclosing 'cursor' is 'PRECURSORY'.
'from' is the link.
Can you help me to learn more?
(Another definition for precursory that I've seen is " Serving to introduce".)