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 there's a link between them I don't understand?
'writes in red is possibly' is the wordplay.
'writes' becomes 'pens' ('pen' can be a synonym of 'write').
'in' means one lot of letters goes inside another.
'possibly' indicates anagramming the letters.
'red'+'is'='redis'
'redis' is an anagram of 'diser'.
'pens' placed 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" .)