19 down
Letter
from
prosecutor
supporting
one
simply
innocent
(6)
Letter from prosecutor supporting one simply innocent (6)
hints
0
checks
0
hints
The definition is at the beginning of the clue.
How the clue works
Look at Letter — that's your definition, a Greek one. LAMB gives you an innocent one, and DA is your district attorney (a prosecutor), with supporting telling you in this down clue that DA sits beneath it. Put them together and there's your answer.