Jotter used by funny poet, Dan (7)
I believe the answer is:
notepad
'jotter' is the definition.
(I've seen this before)
'funny poet dan' is the wordplay.
'funny' is an anagram indicator.
'poet'+'dan'='poetdan'
'poetdan' is an anagram of 'NOTEPAD'.
'used by' is the link.
(Other definitions for notepad that I've seen before include "PC" , "Small block of writing paper" , "aide-memoire" , "Pocket-sized computer" , "Tablet" .)