They reviled uniform caps adorning army at the front (4,4)
I believe the answer is:
uber eats
'they reviled' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.
'uniform caps adorning army at the front' is the wordplay.
I cannot quite understand how this works, but
'uniform' could be 'u' (phonetic alphabet: alpha, bravo, charlie etc.) and 'u' is present in the answer.
'army' could be 're' (Royal Engineers regiment) and 're' is found within the answer.
'at' is present in the answer.
The remaining letters 'bes' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?