Use one line; or it may need two (5)
I believe the answer is:
angle
'use' is the definition.
The definition and answer can be both to do with contact as well as being verbs in their base form.
Perhaps they are linked in a way I don't understand?
'one line or it may need two' is the wordplay.
I cannot really see how this works, but
'one' could be 'an' (an apple is one apple) and 'an' is found in the answer.
'line' could be 'l' (used when specifying particular lines from a poem) and 'l' is located in the answer.
'it' could be 'e' ('e' can mean 'electronic' which is similar to 'IT') and 'e' is found in the answer.
A single letter 'g' remains which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for angle that I've seen before include "Fish with hook and line" , "that is often right" , "Try to catch" , "crook" , "Use a rod and line" .)