Facing material damage to revenue after United's exit (6)
I believe the answer is:
veneer
'facing' is the definition.
(I know that facing can be written as veneer)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for veneer that I've seen before include "Thin decorative covering of fine wood" , "Thin coating on a surface" , "A thin layer on the surface, often wood" , "Superficial appearance" , "A thin outer layer" .)