Perhaps I should just end the agony.
TAUREMORNA is indeed an answer, but to the OTHER clue.
It's TRAUMA + ROE + N.
...
Whereas one who complains whilst fasting could be a LENT GROUCH.
Although admittedly 'lenten' would have been better grammatically, it would NOT, when unstuck, have revealed the terrible horror of ...
TORECH UNGOL.
Mithalwen solved the password. Is she around?