Doctor knew I’ll get a writing accessory (7)
I believe the answer is:
inkwell
'a writing accessory' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'doctor knew i'll' is the wordplay.
'doctor' indicates anagramming the letters.
'knew'+'ill'='knewill'
'knewill' is an anagram of 'INKWELL'.
'get' acts as a link.
Can you help me to learn more?
(Other definitions for inkwell that I've seen before include "Desk reservoir" , "source for old-fashioned writer" , "Small pot for holding writing fluid" , "Reservoir for writing fluid" , "Container for writing fluid" .)