I hear the weirdo used go there pretty often. (8)

I believe the answer is:

frequent

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'often' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

(Other definitions for frequent that I've seen before include "Often, habitual" , "Occurring often" , "happening regularly at short intervals" , "Happening often" , "Occurring many times at short intervals" .)

I've seen this clue in The Irish Times.

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