Liberate from fridge (3)
I believe the answer is:
rid
'liberate' is the definition.
(thesaurus)
'from fridge' is the wordplay.
'from' says the answer is hidden in the clue.
'RID' is hidden within 'fridge'.
(Other definitions for rid that I've seen before include "Lose, shake off" , "Free (someone of something unwanted)" , "Throw off, unburden" , "Free from something unpleasant" , "Free, relieve" .)