He's clumsy, but good with a new tool (6)

I believe the answer is:

galoot

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'he's clumsy' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'good with a new tool' is the wordplay.
'good' becomes 'g' (abbreviation).
'with' indicates putting letters inside.
'new' is an anagram indicator.
'tool' is an anagram of 'loot'.
'a' going inside 'loot' is 'aloot'.
'g'+'aloot'='GALOOT'

'but' acts as a link.

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I've seen this clue in the Evening Standard.

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