He's no good at reversing, either (3)

I believe the answer is:

dud

I'm a little stuck... Click here to teach me more about this clue!

'he's no' is the definition.
'dud' can be an answer for 'no' (thesaurus). I'm unsure of the 'he's' bit.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for dud that I've seen before include "Ineffectual thing/person" , "Defective" , "Valueless" , "Inoperative" , "Non-functioning thing" .)

I've seen this clue in the Evening Standard.

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