Glutton failing to make feasts during matches? Not initially (10)

'glutton failing' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'make feasts during matches? not initially' is the wordplay.
'make feasts' becomes 'dines' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'during' means one lot of letters goes inside another.
'matches?' becomes 'agrees' ('agree' can be a synonym of 'match').
'not initially' means to remove the first letter.
'agrees' with its first letter taken away is 'grees'.
'dines' going inside 'grees' is 'GREEDINESS'.

'to' acts as a link.

Can you help me to learn more?