Boss I introduced to nude swimming without thinking it through (9)

I believe the answer is:

unstudied

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'without thinking it through' is the definition.
I can't tell whether this defines the answer.

'boss i introduced to nude swimming' is the wordplay.
'boss' becomes 'stud' (both can mean a metal decoration).
'introduced to' is an insertion indicator.
'swimming' is an anagram indicator.
'stud'+'i'='studi'
'nude' with letters rearranged gives 'uned'.
'studi' inserted inside 'uned' is 'UNSTUDIED'.

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I've seen this clue in The Independent.

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