Writes in red "Is possibly a vending machine" (9)
I believe the answer is:
dispenser
'a vending machine' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'writes in red is possibly' is the wordplay.
'writes' becomes 'pens' ('pen' can be a synonym of 'write').
'in' indicates putting letters inside.
'possibly' is an anagram indicator.
'red'+'is'='redis'
'redis' with letters rearranged gives 'diser'.
'pens' put within 'diser' is 'DISPENSER'.
Can you help me to learn more?
(Other definitions for dispenser that I've seen before include "one to give out" , "Pharmacist" , "One filling prescription" , "Container releasing its contents in prescribed amounts" , "Chemist" .)