With lid removed, finished fluid
I believe the answer is:
open-ended
'fluid' is the definition.
Both the answer and definition are adjectives. Perhaps there's a link between them I don't understand?
'with lid removed finished' is the wordplay.
I cannot really understand how this works, but
'finished' could be 'ended' ('ended' can be similar in meaning to 'finished') and 'ended' is present in the answer.
The remaining letters 'open' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for open-ended that I've seen before include "Without fixed limits or restrictions" , "Having no fixed limit, perhaps a discussion" , "Allowing free debate with no set time to finish." , "With no fixed limit, not circumscribed" , "Having no predetermined limit" .)