Finding bather's wet top, he confused people in authority (15)

I believe the answer is:

thepowersthatbe

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'authority' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'finding bather's wet top he confused people' is the wordplay.
'bather's wet top he' can be anagrammed to 'THEPOWERSTHATBE'.
Though, I am unsure how this is indicated.

'in' is the link.

Can you help me to learn more?

I've seen this clue in The Daily Express.

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