Target's aim somehow to find justice (10)
I believe the answer is:
magistrate
'justice' is the definition.
(I know that justice can be written as magistrate)
'target's aim somehow' is the wordplay.
'somehow' is an anagram indicator.
'targets'+'aim'='targetsaim'
'targetsaim' anagrammed gives 'MAGISTRATE'.
'to find' acts as a link.
(Other definitions for magistrate that I've seen before include "Court officer" , "Judge" , "Court head" , "Dispenser of justice" , "Capital of Ethiopia" .)