Used by writer and poet perhaps (7)
I believe the answer is:
notepad
'used by writer' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.
'and poet perhaps' is the wordplay.
'perhaps' indicates an anagram.
'and'+'poet'='andpoet'
'andpoet' is an anagram of 'NOTEPAD'.
Can you help me to learn more?
(Other definitions for notepad that I've seen before include "On which one writes" , "Where memos get written" , "Place for recording" , "Block of writing paper; computer" , "Tablet" .)