Talk with Santander, say, to get bond (7)
I believe the answer is:
rapport
'bond' is the definition.
(I've seen this before)
'talk with santander say' is the wordplay.
'talk' becomes 'rap' (rapping is a kind of talking).
'with' means one lot of letters go next to another.
'santander say' becomes 'port' (I can't explain this - if you can you should give a lot more credence to this answer).
'rap'+'port'='RAPPORT'
'to get' is the link.
Can you help me to learn more?
(Other definitions for rapport that I've seen before include "Relation, connection" , "Feeling of sympathy and understanding" , "Mutual harmony and affinity" , "Feeling of affinity and harmony" , "communion" .)