Exhausted, stopped noticing surroundings around end of walk (6,3)
I believe the answer is:
zonked out
'end of walk' is the definition.
I don't know anything about this answer so I cannot tell whether this works.
'exhausted stopped noticing surroundings' is the wordplay.
'exhausted' suggests removing the centre (the word is emptied out or exhausted).
'stopped' becomes 'ended' ('end' can be a synonym of 'stop').
'noticing' becomes 'zonkout' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'surroundings' is an insertion indicator.
'ended' with its centre taken out is 'ed'.
'ed' placed inside 'zonkout' is 'ZONKED OUT'.
'around' is the link.
Can you help me to learn more?
(Other definitions for zonked out that I've seen before include "Utterly exhausted" , "Unconscious" , "tired" , "Stoned" .)