Pressing swelling squeezing out head (6)
I believe the answer is:
urgent
'pressing' is the definition.
(I know that pressing can be written as urgent)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for urgent that I've seen before include "Needing immediate attention, don't delay" , "Requiring immediate attention" , "Pressing, important" , "Calling for immediate attention" , "Pressing, immediate" .)