Sink with air coming the wrong way (3)
I believe the answer is:
sag
'sink' is the definition.
(I know that sag is a type of sink)
'air coming the wrong way' is the wordplay.
'air' becomes 'gas' (I've seen this in other clues).
'coming the wrong way' says the letters should be written backwards.
'gas' backwards is 'SAG'.
'with' is the link.
(Other definitions for sag that I've seen before include "Sinking" , "Hang down loosely" , "Decline" , "Fail to retain interest" , "Lose energy" .)