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Unfortunately I'm no dad, but good bloke (7)

Ross

I believe the answer is:

diamond

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'good bloke' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'unfortunately i'm no dad' is the wordplay.
'unfortunately' indicates anagramming the letters (a bad or unfortunate spelling).
'im'+'no'+'dad'='imnodad'
'imnodad' with letters rearranged gives 'DIAMOND'.

'but' acts as a link.

Can you help me to learn more?

(Other definitions for diamond that I've seen before include "Very hard gem" , "Gem stone" , "Kohinoor, Hope" , "One of her best friends" , "nickname of US State" .)

I've seen this clue in The Sun.
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