Your 'one and a half letters' was fiendishly clever.
Unfortunately I am not, and am still stuck for the moment.
However, I am going to try this clue:
5. A - Love lace and flatfish? Like a ring!
and guess ALATIRIEL, because:
a) It is certainly a 'gleaming' name - 'maiden crowned with a garland of radiance.'
b) It has TIE for 'lace.'
c) Errrrrr……
d) Ala is Quenya for plaice (the word for chips appears in the same song - it's Celeborn's favourite dish).