Renew+N = Nerwen
FINGOLFIN: Fish appendages surround an endless sport for him.
E: A lake switches vowels. Add a number and spin it for him.
AEGNOR: Shuffle a Roman siege engine for him
NERWEN: A direction appears in a new form. Spin it for her.
ORODRETH: An entrance in a spin, initially really encourages through here, for him.
A
RGON: He is noble.
THEME: FINWEANS
Be glad I didn't include Maeglin, again.