It's humiliating to be ordered to alight (8)
I believe the answer is:
comedown
'it's humiliating' is the definition.
(I've seen this before)
'be ordered to alight' is the wordplay.
I cannot really see how this works, but
'be' could be 'come' (coming is a kind of being) and 'come' is found within the answer.
The remaining letters 'down' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'to' acts as a link.
Can you help me to learn more?
(Other definitions for comedown that I've seen before include "Decrease" , "Anticlimax" , "Do cowmen experience a loss of status?" , "Feeling of disappointment" , "Loss of position or status" .)