He moves between banks transferring customers (8)
I believe the answer is:
ferryman
'he moves between banks transferring customers' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'he' is the wordplay.
I cannot quite understand how this works, but
'he' could be 'man' (I've seen this in another clue) and 'man' is located in the answer.
The remaining letters 'ferry' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for ferryman that I've seen before include "Charon's occupation on the River Styx" , "Aquatic taxi driver" , "One plying a short water crossing" , "He rows people across a river, like Charon" , "eg Charon (on the Styx)" .)