Hunt one playing victim, showing sign of uncertainty (8,4)
I believe the answer is:
question mark
'sign of uncertainty' is the definition.
'question mark' can be an answer for 'sign' (question mark is a kind of sign). I am not certain of the 'of uncertainty' bit.
'hunt one playing victim' is the wordplay.
I cannot quite understand how this works, but
'hunt' could be 'quest' (synonyms) and 'quest' is located in the answer.
'one' could be 'i' (Roman numeral) and 'i' is located in the answer.
'playing' could be 'on' (on can mean playing or performing) and 'on' is found in the answer.
'victim' could be 'mark' (mark is a kind of victim) and 'mark' is found within the answer.
No letters remain.
This explanation may well be incorrect...
'showing' acts as a link.
Can you help me to learn more?
(Other definitions for question mark that I've seen before include "Query" , "Not believe the gospel" , "Expression of uncertainty" , "What ends this" .)