Lead in reformed Biblical character (6)
I believe the answer is:
daniel
'biblical character' is the definition.
(Old Testament prophet)
'lead in reformed' is the wordplay.
'reformed' is an anagram indicator.
'lead'+'in'='leadin'
'leadin' anagrammed gives 'DANIEL'.
(Other definitions for daniel that I've seen before include "He was delivered by a god from the lions' den" , "Hebrew prophet rescued from lion's den" , "Make larger" , "Craig, Day-Lewis or Radcliffe?" , "-- Barenboim, -- Boone" .)