Bankers from Santander moving slowly (7)
I believe the answer is:
andante
'slowly' is the definition.
(musical term)
'bankers from santander moving' is the wordplay.
'bankers from' says to take the centre (the edges or 'banks' of the word are removed).
'moving' indicates anagramming the letters.
The middle letters of 'santander' are 'antande'.
'antande' with letters rearranged gives 'ANDANTE'.
(Other definitions for andante that I've seen before include "Unhurried pace" , "Noted instruction" , "quite slow" , "not quickly" , "progressing slowly" .)