It's no good being a bit of a dude (3)

I believe the answer is:

dud

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'it's no' is the definition.
(thesaurus)

'good being a bit of a dude' is the wordplay.
'good' becomes 'du' (I can't justify this - if you can you should believe this answer much more).
'being a bit of' suggests taking the first letters.
The initial letter of 'dude' is 'd'.
'du'+'d'='DUD'

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(Other definitions for dud that I've seen before include "'Flop, turkey (3)'" , "Ineffectual thing/person" , "Defective" , "A palindromic failure" , "Forged" .)

I've seen this clue in the Evening Standard.

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