Saint Joan author (4)
I believe the answer is:
shaw
'saint joan author' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for shaw that I've seen before include "writer of plays and critical commentaries" , "Irish author" , "making an appearance in Craiglockhart?" , "Man and Superman playwright" , "Irish playwright, d. 1950" .)