Remove a seer, somehow (5)
I believe the answer is:
erase
'remove' is the definition.
(to erase is to remove)
'a seer somehow' is the wordplay.
'somehow' is an anagram indicator.
'a'+'seer'='aseer'
'aseer' anagrammed gives 'ERASE'.
(Other definitions for erase that I've seen before include "Remove evidence of" , "Rub out, cancel" , "To remove all trace" , "Blank out" , "score" .)