Above it all, in a way (7)
I believe the answer is:
tallest
'above it all in a way' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tallest that I've seen before include "most implausible" , "Of greatest height" , "Sell tat (anag.)" , "Of greatest vertical extent" , "Of extreme height" .)