Pests restricting US telecom company network (7)
I believe the answer is:
lattice
'network' is the definition.
(I've seen this before)
'pests restricting us telecom company' is the wordplay.
'pests' becomes 'lice' (lice are pests).
'restricting' is an insertion indicator.
'us telecom company' becomes 'ATT' (AT and T is a US telecommunications company).
'lice' going around 'att' is 'LATTICE'.
(Other definitions for lattice that I've seen before include "grill" , "Openwork structure" , "Screen of crossed bars" , "Network of Wooden strips" , "Structure with criss-cross strips" .)