Bank card finally split (5)
I believe the answer is:
Here is my best explanation:
'bank' is the definition.
'card finally split' is the subsidiary indication.
'finally' suggests the final letters.
'split' becomes 'rift' (I've seen this in other clues**).
The last letter of 'card' is 'd'.
(Other definitions for drift that I've seen before include "move around without end", "Snow heaped up by wind", "general idea?", "import", "Snow pile", "aimless", "Travel without purpose", "Be slowly carried by a current", "Float with current" and "Move with wind and tide".)