Wise man with inner cunning is a seeker (8)
I believe the answer is:
searcher
'seeker' is the definition.
(I know that seeker can be written as searcher)
'wise man with inner cunning' is the wordplay.
'wise man' becomes 'seer' (I've seen this in another clue).
'with inner' indicates putting letters inside.
'cunning' becomes 'arch' (arch can mean cunning or tricksy).
'seer' going around 'arch' is 'SEARCHER'.
'is a' acts as a link.
(Other definitions for searcher that I've seen before include "One looking for something" , "Scare her (anag)" , "Seeker" , "One may be Googling" , "One looking for hidden objects" .)