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 can't justify this - if you can you should believe this answer much more).
'surroundings' means one lot of letters goes inside another.
'ended' with its centre removed is 'ed'.
'ed' placed into '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" .)