Crazy golfers largely tell you — relax! (3,8,2)
I believe the answer is:
let yourself go
'relax' is the definition.
(to let yourself go is to relax)
'crazy golfers largely tell you' is the wordplay.
'crazy' indicates anagramming the letters.
'largely' means to remove the last letter (most but not all of the letters).
'tell' with its last letter taken away is 'tel'.
'golfers'+'tel'+'you'='golferstelyou'
'golferstelyou' anagrammed gives 'LET YOURSELF GO'.
(Another definition for let yourself go that I've seen is " act unconditionally".)
I've seen this clue in The Guardian.
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