Under pressure, debate moving queen up one space — capital! (6)
I believe the answer is:
prague
'capital' is the definition.
(capital of Czechia)
'under pressure debate moving queen up one space' is the wordplay.
I cannot really understand how this works, but
'pressure' could be 'p' (abbreviation) and 'p' is found within the answer.
'queen' could be 'r' (abbreviation for regina, e.g. in ER ) and 'r' is located in the answer.
'one' could be 'a' (a thing is one thing) and 'a' is found in the answer.
The remaining letters 'gue' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for prague that I've seen before include "Gear up for this European city" , "Capital city of Czech Republic" , "Czech Republic's capital" , "European capital" , "Rather quiet" .)