Inexperienced person with some weak ideas (3)

I believe the answer is:

kid

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'inexperienced person' is the definition.
'kid' can be an answer for 'person' (kid is a kind of person). I am not sure about the 'inexperienced' bit.

'with some weak ideas' is the wordplay.
'with' indicates a hidden word.
'KID' can be found hidden inside 'some weak ideas'.

Can you help me to learn more?

(Other definitions for kid that I've seen before include "little one" , "Soft leather" , "Goat - boy" , "Joke" , "Schoolboy" .)

I've seen this clue in the Evening Standard.

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