Crossword Genius

Avail yourself of the plane coming back, too... (5)

Ross

I believe the answer is:

level

I'm a little stuck... Click here to teach me more about this clue!

'avail' is the definition.
The definition and answer can be both human attributes as well as being singular nouns.
Maybe there's an association between them I don't understand?

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for level that I've seen before include "Floor; horizontal" , "Palindromically smooth" , "Neither winning, nor losing" , "Storey - stage" , "Equal; flat" .)

I've seen this clue in the Evening Standard.
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