Urging one, as it's high-priority (8)
I believe the answer is:
pressing
This could be a double definition.
'urging one' is the first definition.
'pressing' can be an answer for 'urging' ('press' can be a synonym of 'urge'). I'm not certain of the 'one' bit.
'it's high-priority' is the second definition.
(thesaurus)
'as' acts as a link.
Can you help me to learn more?
(Other definitions for pressing that I've seen before include "Important" , "Task for record company" , "Requiring immediate attention" , "application of buttons?" , "in need of immediate attention" .)