Priest leading prior to worship (6)
I believe the answer is:
revere
'worship' is the definition.
('revere' can be a synonym of 'worship')
'priest leading prior' is the wordplay.
'priest' becomes 'rev'.
'leading' says to put letters next to each other.
'prior' becomes 'ere' ('ere' can be a synonym of 'prior').
'rev'+'ere'='REVERE'
'to' is the link.
(Other definitions for revere that I've seen before include "Show great respect for" , "Paul -, US revolutionary patriot" , "Show huge respect for" , "Renowned rider" , "Think a lot of" .)