Joint bank statement revealing some doubts (6)
I believe the answer is:
reefer
'joint' is the definition.
(informal term for a marijuana joint)
'bank statement revealing some doubts' is the wordplay.
I cannot really see how this works, but
'bank' could be 'reef' (I've seen this before) and 'reef' is located in the answer.
The remaining letters 'er' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for reefer that I've seen before include "A wool jacket; a spliff" , "packed with cannabis?" , "Joint; spliff" , "Something designed for smoking" , "Type of jacket - smoke" .)