BLACK...and another letter is in 'vanish' (check the obvious word in Chambers for the 2 defs).
CLERIC, yes (but a two letter word before this, not a single).
What an excellent puzzle....just one i can't see ...
4d Harmonise Trump's conceits, expecting to be exhausted with his bad breath rubbishing doctrine. (8) BIGHEADS... how does it parse please?
extra 2 or 3 words must give the bottom right shaded ?