Bearing left for Luton, possibly (7)
I believe the answer is:
airport
'luton possibly' is the definition.
(London Luton Airport)
'bearing left' is the wordplay.
'bearing' becomes 'air' (both can mean an attitude or pose).
'left' becomes 'port' (left side of a ship - opposite of starboard).
'air'+'port'='AIRPORT'
'for' is the link.
(Other definitions for airport that I've seen before include "Charles de Gaulle, for instance" , "duty-free location?" , "Traveller terminus" , "Fliers' terminus" , "Eg, Heathrow" .)