Breathe in groggily and go to sleep (9)
I believe the answer is:
hibernate
'sleep' is the definition.
(I know that hibernate is a more specific form of the action sleep)
'breathe in groggily' is the wordplay.
'groggily' is an anagram indicator.
'breathe'+'in'='breathein'
'breathein' is an anagram of 'HIBERNATE'.
'and go to' is the link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for hibernate that I've seen before include "remain inactive for months" , "Of animals, sleep through the winter" , "Become dormant" , "go dormant" , "Breathe in to settle down for winter sleep" .)