Network, good and clear (4)
I believe the answer is:
grid
'network' is the definition.
(grid is a kind of network)
'good and clear' is the wordplay.
'good' becomes 'g' (abbreviation).
'and' says to put letters next to each other.
'clear' becomes 'rid' (synonyms).
'g'+'rid'='GRID'
(Other definitions for grid that I've seen before include "F1 starting point" , "a network of squares as in this puzzle" , "Rectangular network" , "Barred framework" , "powerful network" .)