Some advocate networking, in principle (5)
I believe the answer is:
tenet
'principle' is the definition.
(thesaurus)
'some advocate networking in' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'TENET' can be found hidden inside 'advocate networking in'.
(Other definitions for tenet that I've seen before include "Item of belief" , "A palindromic doctrine or creed" , "Adiaphoron" , "Belief - maxim" , "Rule" .)