Adviser seen amongst raiders (4)
I believe the answer is:
aide
'adviser' is the definition.
'amongst raiders' is the wordplay.
'amongst' indicates a hidden word.
'AIDE' can be found hidden inside 'raiders'.
'seen' is the link.
(Other definitions for aide that I've seen before include "One to assist" , "a help" , "auxiliary" , "Right-hand man/woman" , "one helping" .)