Free fridge part (3)
I believe the answer is:
rid
'free' is the definition.
(to be free of something is to be rid of it)
'fridge part' is the wordplay.
'part' indicates the answer is hidden within the clue.
'RID' is hidden within 'fridge'.
(Other definitions for rid that I've seen before include "Free, disencumber" , "Free, deliver, clear" , "Throw off, unburden" , "Free from something unpleasant" , "Lose, shake off" .)