Demands mask suddenly (4)
I believe the answer is:
asks
'demands' is the definition.
('ask' can be a synonym of 'demand')
'mask suddenly' is the wordplay.
'ASKS' is hidden within the letters.
But, I'm unsure how this is indicated.
Can you help me to learn more?
(Other definitions for asks that I've seen before include "Inquires (4)" , "Questions" , "Requests information about" , "Makes an inquiry" , "is curious" .)