Observe as they bring up all-powerful entity who monitors everything they do (8)
I believe the answer is:
watchdog
'they do' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'observe as they bring up all-powerful entity who monitors everything' is the wordplay.
I cannot quite see how this works, but
'observe' could be 'watch' (synonyms) and 'watch' is located in the answer.
'entity' could be 'dog' (dog is a kind of entity) and 'dog' is found within the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for watchdog that I've seen before include "Heroic poem" , "Canine guard" , "protector" , "TV consumer programme" , "Person or canine acting as guardian" .)