Bloke holding drunk up is a sugary type (7)

'a sugary type' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

'bloke holding drunk up' is the wordplay.
'bloke' becomes 'male' (bloke means a man).
'holding' is an insertion indicator.
'drunk' becomes 'sot' (sot can mean a drunken person).
'up' says the letters should be written backwards (in down clue: letters go upwards).
'sot' backwards is 'tos'.
'male' placed around 'tos' is 'MALTOSE'.

'is' is the link.

Can you help me to learn more?