Lodge in Exmoor e.g. is terrific (8)
I believe the answer is:
register
'lodge' is the definition.
(thesaurus)
'in exmoor e g is terrific' is the wordplay.
'in' indicates the answer is hidden within the clue.
'REGISTER' is hidden in the letters of 'exmoor e g is terrific'.
(Other definitions for register that I've seen before include "Enrol, to vote perhaps" , "(Enrol in) list" , "Index" , "Official list of names" , "File, record" .)