Part of Hamlet is so flipping ridiculous, mostly (5)

I believe the answer is:
osric
'part of hamlet' is the definition.
The definition suggests a singular noun which matches the answer.
'so flipping ridiculous mostly' is the wordplay.
'flipping' says the letters should be written in reverse.
'ridiculous' becomes 'rich' ('that's rich' can mean 'that's ridiculous').
'mostly' means to remove the last letter (most but not all of the word).
'so' written backwards gives 'os'.
'rich' with its last letter taken off is 'ric'.
'os'+'ric'='OSRIC'
'is' is the link.
Can you help me to learn more?
(Other definitions for osric that I've seen before include "Shakespearean courtier" , "Shakespearian" , "Danish courtier" .)
