Help root out explorer (8)
I believe the answer is:
potholer
'explorer' is the definition.
(I know that potholer is a type of explorer)
'help root out' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'help'+'root'='helproot'
'helproot' is an anagram of 'POTHOLER'.
(Other definitions for potholer that I've seen before include "Caver" , "Explorer of underground caves" , "Speleologist" .)