I don't understand 1ac either and have the same answer. I think "rank" is unqualified as in "rank amateur", i.e, "total amateur". I have -IR- for 33dn. and just the final S for 40ac. Any hints welcome.
I think the third "extra definition" is "avoid" in 36ac. Have now got the four "outcome answers", just looking for the six "jumbled" items so I can work out the word to be written at the bottom of the grid.