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Last two at 6A and 6D seem to be Jape and Janus respectively but the parsing is puzzling. The clues are:
6A Jack accompanied by 4 ( 4A solution is parrot) as practical joke - I have --P- ;
6D Judge, in formal style, my architect (6) - I have --N-S.
Any thoughts welcome.

J Ape?

6a ape/parrot = imitate, so Jack + APE

Jack = J + ape = parrot as in to copy or mimic
Jones (Inigo) Judge = J + one's (my formally).

Inigo JONES = J +One's

parrot=ape gives jape
my formal= one's gives Jones (Inigo)

Thanks, everyone. I should have got jape, but Jones- never in a million years!