squealing clutch

I have a micra 1.0 1993, the clutch has started squealing. This only happens when the car has been run for about 30 mins. When I am de-accelerating coming up to a roundabout for instance, press the clutch and it starts squealing. This doesn't happen when accelerating though. The clutch isn't slipping, and gear changes are still exact. anyone have any ideas??
 
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