Account with line suggesting agreement (6)
I believe the answer is:
accord
'agreement' is the definition.
(accord is a kind of agreement)
'account with line' is the wordplay.
'account' becomes 'ac'.
'with' means one lot of letters go next to another.
'line' becomes 'cord' (cord is a kind of line).
'ac'+'cord'='ACCORD'
'suggesting' is the link.
(Other definitions for accord that I've seen before include "Model" , "Harmony; treaty" , "Harmony and fellowship" , "Official agreement; harmony" , "Agreement - conformity" .)