Studies collecting each source of currants for fruit buns (8)

'fruit buns' is the definition.
The answer and definition can be both things that one consumes for nourishment as well as being plural nouns.
Perhaps there's a link between them I don't understand?

'studies collecting each source of currants' is the wordplay.
'studies' becomes 'takes' ('take' can be a synonym of 'study').
'collecting' is an insertion indicator.
'each' becomes 'ea' (abbreviation).
'source of' suggests taking the first letters (the start - or source - of the word).
The first letter of 'currants' is 'c'.
'ea'+'c'='eac'
'takes' placed around 'eac' is 'TEACAKES'.

'for' is the link.

Can you help me to learn more?