Stupid leaders of Bank of England guzzling French wine (6)
I believe the answer is:
bovine
'stupid' is the definition.
(I've seen this before)
'leaders of bank of england guzzling french wine' is the wordplay.
'leaders of' suggests taking the first letters.
'guzzling' means one lot of letters goes inside another (I've seen this in other clues).
'french wine' becomes 'vin' ('wine' in French).
The initial letters of 'bank of england' is 'boe'.
'boe' enclosing 'vin' is 'BOVINE'.
(Other definitions for bovine that I've seen before include "Resembling cattle" , "Relating to cattle" , "(Like a) yak, for example" , "Like cattle" , "To do with cows, dull and stupid" .)