Heard of search for religious follower (4)
I believe the answer is:
sikh
'religious follower' is the definition.
(member of the Sikh faith)
'heard of search' is the wordplay.
'heard of' shows a homophone (sound like).
'search' becomes 'seek' (synonyms).
'seek' sounds like 'SIKH'.
'for' is the link.
(Other definitions for sikh that I've seen before include "Religious adherent (eastern)" , "Member of a Hindu religion" , "Religious follower" , "An adherent of religion founded in the Punjab" , "Member of an Indian religion" .)