Polymath 508

[Wheelbrace]

16d At times,fully or yet to a poet (3) E?N
Surely EEN but apart from being a poetic "yet" I cant tally the rest of the clue

39a Indicted by a grand jury in US to face charges in court(4,6) ?R?? ?I?L?D
I have Free Willed but cant find any such process relative to US law.
Any other suggestions please?

[Lie-in King]

16d Yes, 'E'en' - as 'exactly' (fully) & 'so much as' (at times) - not really sure about that one, but it has to be the right answer...

39a True-billed

[Wheelbrace]

Thanks Lie-in King.
Quite right on Free billed - I missed it in Chambers!