Title of Munch Moon painting initially without his name, strangely (12)

'title' is the definition.
(synonyms)

'munch moon painting initially without his name strangely' is the wordplay.
I cannot really see how this works, but
'munch' could be 'champ' (both can mean to bite) and 'champ' is located in the answer.
'moon' could be 'io' (moon of Jupiter) and 'io' is present in the answer.
an anagram of 'his' is 'shi' which is located in the answer.
'name' could be 'n' (common abbreviation e.g. on forms) and 'n' is found in the answer.
A single letter 'p' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...

'of' is the link.