Shop arranged essential though not very patient service (8)
I believe the answer is:
hospital
'not very patient service' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'shop arranged essential' is the wordplay.
'arranged' indicates anagramming the letters (letters rearranged).
'essential' becomes 'ital' (I am not sure about this - if you are sure you should believe this answer much more).
'shop' is an anagram of 'hosp'.
'hosp'+'ital'='HOSPITAL'
'though' is the link.
Can you help me to learn more?
(Other definitions for hospital that I've seen before include "Spoil hat (anag)" , "Infirmary" , "Healing institution" , "Treatment and care centre" , "Medical institution" .)