Pal I shot mistakenly — and where he ended up? (8)
I believe the answer is:
hospital
'where he ended up?' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'pal i shot mistakenly' is the wordplay.
'mistakenly' indicates anagramming the letters.
'pal'+'i'+'shot'='palishot'
'palishot' is an anagram of 'HOSPITAL'.
'and' acts as a link.
(Other definitions for hospital that I've seen before include "Infirmary" , "asylum?" , "Has pilot gone there for help?" , "Stop hail (anag.)" , "Medical institution" .)