Inquiring; quizzing (6)
I believe the answer is:
asking
I believe this is a double definition.
'inquiring' is the first definition.
('ask' can be a synonym of 'inquire')
'quizzing' is the second definition.
(I've seen this in another clue)
(Other definitions for asking that I've seen before include "Making enquiries" , "Proposing" , "Presenting petition" , "It demands explanation!" , "Putting question or requesting" .)