In a natural state, but only just (4)

I believe the answer is:

bare

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'in a natural state' is the definition.
I can't judge whether this definition defines the answer.

'but only just' is the wordplay.
'but' becomes 'bar' (both can mean 'excluding' or 'except').
'only just' becomes 'e' (I am not sure about this - if you are sure you should believe this answer much more).
'bar'+'e'='BARE'

Can you help me to learn more?

(Other definitions for bare that I've seen before include "Unclad" , "Uncovered - unfurnished - unadorned" , "Stark - naked" , "Not covered" , "Nude; uncover" .)

I've seen this clue in the Evening Standard.

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