One who's mad enough to have no inhibitions? (5)

I believe the answer is:

raver

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'have no inhibitions?' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe there's a link between them I don't understand?

I don't understand the remainder of the clue.

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(Other definitions for raver that I've seen before include "Party animal" , "Madman" , "Dedicated partygoer" , "one talking incoherently" , "Wild partygoer" .)

I've seen this clue in the Evening Standard.

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