Bearing left in Heathrow, say (7)
I believe the answer is:
airport
'heathrow say' is the definition.
(Heathrow is an airport)
'bearing left' is the wordplay.
'bearing' becomes 'air' (I've seen this before).
'left' becomes 'port' (left side of a ship - opposite of starboard).
'air'+'port'='AIRPORT'
'in' acts as a link.
(Other definitions for airport that I've seen before include "E.g. Prestwick, Gatwick" , "Liverpool's John Lennon, for example" , "Place for planes" , "Heathrow or similar place" , "Terminal for planes" .)