Lutheran court full of bitterness (7)
I believe the answer is:
rancour
'bitterness' is the definition.
(synonyms)
'lutheran court full of' is the wordplay.
'full of' indicates the answer is hidden within the clue (inside).
'RANCOUR' is hidden in the letters of 'lutheran court'.
(Other definitions for rancour that I've seen before include "Acrimony" , "Bitterness and ill will" , "Bitterness or resentfulness" , "Malicious hostility" , "Spiteful hostility" .)