Stupid and clumsy - oh, as if drunk! (6)
I believe the answer is:
oafish
'stupid' is the definition.
(I've seen this before)
'oh as if drunk' is the wordplay.
'drunk' indicates anagramming the letters.
'oh'+'as'+'if'='ohasif'
'ohasif' with letters rearranged gives 'OAFISH'.
'and clumsy' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for oafish that I've seen before include "Like a lout" , "Stupid, boorish" , "having poor manners" , "Doltish" , "Loutish" .)