Strike left by such accord (7)
I believe the answer is:
rapport
'accord' is the definition.
(synonyms)
'strike left by' is the wordplay.
'strike' becomes 'rap' (synonyms).
'left' becomes 'port' (left side of a ship - opposite of starboard).
'by' says to put letters next to each other.
'rap'+'port'='RAPPORT'
'such' acts as a link.
(Other definitions for rapport that I've seen before include "Bond of sympathy" , "Relation, connection" , "Empathy" , "Pro rapt with fellow feeling" , "Mutual sensitivity and understanding" .)