Modest in the extreme, show reluctance to share recipe with others (8)

'reluctance to share recipe with others' is the definition.
I can't tell whether this defines the answer.

'modest in the extreme show' is the wordplay.
'modest' becomes 'emures' (I am not sure about this - if you are sure you should believe this answer much more).
'in the' is an insertion indicator.
'extreme' means to remove the middle letters.
'show' becomes 'depict' (to depict is to show or portray).
'depict' with its middle removed is 'dt'.
'emures' put inside 'dt' is 'DEMUREST'.

Can you help me to learn more?