It carries weight in navigation (7)
I believe the answer is:
bearing
'navigation' is the definition.
(thesaurus)
'it carries weight in' is the wordplay.
I cannot really understand how this works, but
'it' could be 'e' ('e' can mean 'electronic' which is similar to 'IT') and 'e' is found within the answer.
'in' is present in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for bearing that I've seen before include "Carriage; relevance" , "Attitude - pivot - reference" , "Position" , "north?" , "Deportment" .)