### Clue: Old carrier left to absorb another one in bad faith (8)
### Answer: BETRAYAL 
 ### Explanation: Definition: bad faith
An envelope ('to absorb') of TRAY ('another one' i.e. another 'carrier', in this case just the usual meaning of something to carry e.g. food) in BEA ('old carrier' here the airline British European Airways) plus L ('left').