Current leader of chain in coffee network (7)
I believe the answer is:
lattice
'network' is the definition.
(I've seen this before)
'current leader of chain in coffee' is the wordplay.
'current' becomes 'I' (symbol for electric current).
'leader of' says to take the initial letters.
'in' is an insertion indicator.
'coffee' becomes 'latte' (I've seen this before).
The initial letter of 'chain' is 'c'.
'i'+'c'='ic'
'ic' going inside 'latte' is 'LATTICE'.
(Other definitions for lattice that I've seen before include "Openwork structure" , "Web" , "Screen of crossed bars" , "type of tracery" , "Trellis: maybe" .)