He's no Goliath! (5)

I believe the answer is:

david

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This clue could be a double definition.

'he's' is the first definition.

'no goliath' is the second definition.
The definition suggests a singular noun which matches the answer.

Can you help me to learn more?

(Other definitions for david that I've seen before include "Goliath's slayer" , "The Psalmist" , "friend of Jonathan's?" , "Dickens hero" , "King of Judah and Israel, Saul's successor" .)

I've seen this clue in the Evening Standard.

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