Bank card finally split (5)
I believe the answer is:
drift
'bank' is the definition.
(thesaurus)
'card finally split' is the wordplay.
'finally' says to take the final letters.
'split' becomes 'rift' (I've seen this before**).
The last letter of 'card' is 'd'.
'd'+'rift'='DRIFT'
(Other definitions for drift that I've seen before include "General idea (of snow?)" , "General meaning or flow" , "Walk casually; snow pile" , "Snow heaped up by wind" , "Movement off course or in general" .)