MELIAN: Citrus confused, if Shakespeare .... Citrus confused, exchanges Westron exclamation for elvish one, in reflection. But both roads lead to her!
ARIEN: Old dwarf - that is, confused. But leads to a bright girl!
ILMARE: Post confused regarding her.
ALATAR: He stands clear, when Brooklyn prostitute loses direction in her confusion.
R: Flora Thompson’s glides still, though it meanders within the place of the real hemlock glade. Lose a sibilant to reveal him.
Yes, this password has a theme, and the answer is MAIAR.
Re = short for regarding: hence ILMARE.
Slight mis-spelling of MELIAN
You got the two correct citrus fruits, and the correct end result, but it was two separate clues leading to the same answer.
1. LIME confused = MELI, plus AN, a word Shakespeare often used to mean 'if.' Example:
'Get up, get up, an you be a man!' (The Nurse in 'Romeo and Juliet').
2. LEMON confused gives MELON. Exchange the Westron exclamation O for the elvish one, AI (as in 'Ai! Ai! A Balrog!'), but reflect it (put it in backwards). Hence: MELIAN.
EDIT: Aragorn asked for a reward - to become Frodo's companion! Of course. (Referring to one of Morsul's 'Bombadil' clues).