A chit, maybe, or letter (5)
I believe the answer is:
aitch
'letter' is the definition.
(aitch is the name for the letter H)
'a chit maybe' is the wordplay.
'maybe' is an anagram indicator.
'chit' with letters rearranged gives 'itch'.
'a'+'itch'='AITCH'
'or' is the link.
(Other definitions for aitch that I've seen before include "what some drop?" , "The letter h in full" , "first bit of hymn?" , "bone" , "that may be dropped" .)