Thanks Melini,
14d - as you mention ultimaties, take a letter in the second word of the answer (the only vowel) and switch the letter at one extreme of 'inertia' and switch it for the one at the other extreme - this will change a term meaning 2inertial2 as in 'be stationary' and change to a term meaning 'assume proud position'.
Sorry, it is a complicated parse and I don't think I've done a very good job at explaining it:-(