Agreement with current line (6)
I believe the answer is:
accord
'agreement' is the definition.
(accord is a kind of agreement)
'with current line' is the wordplay.
'with' says to put letters next to each other.
'current' becomes 'ac' (alternating current).
'line' becomes 'cord' (cord is a kind of line).
'ac' put next to 'cord' is 'ACCORD'.
(Other definitions for accord that I've seen before include "'Agreement, treaty (6)'" , "Correspond" , "Model" , "Harmony, concurrence" , "Agree" .)