Possible Clues:

• Employee's benefit as an entitlement of job
• Brighten, with 'up'
• Enliven, with 'up'
• Company car, for one
• Cheer, given extra privilege
• Lift (up)
• Being mostly cheerful is a benefit
• Become lively, with 'up'
• -- up (improve)
• Free gym membership, e.g.