River's current beginning to deceive us (5)
I believe the answer is:
indus
'river's' is the definition.
(Indus is an example)
'current beginning to deceive us' is the wordplay.
'current' becomes 'in' (I've seen this in other clues**).
'beginning to' indicates taking the first letters.
The initial letter of 'deceive' is 'd'.
'in'+'d'+'us'='INDUS'
(Other definitions for indus that I've seen before include "Sacred flower" , "banker" , "running water" , "River of India and Pakistan" , "9 of Pakistan" .)