Writer's well popular, returning to peak! (6)
I believe the answer is:
inkpot
'writer's well' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'popular returning to peak' is the wordplay.
'popular' becomes 'ink' (I can't explain this - if you can you should believe this answer much more).
'returning' says the letters should be written backwards.
'to peak' becomes 'top' (synonyms).
'top' back-to-front is 'pot'.
'ink'+'pot'='INKPOT'
Can you help me to learn more?
(Other definitions for inkpot that I've seen before include "that may assist writer" , "Vessel for writing fluid" , "Source for old writer" , "fluid container" , "Topper-up for old writer" .)