Juicer contains something cold (3)
I believe the answer is:
ice
'something cold' is the definition.
'juicer contains' is the wordplay.
'contains' says the answer is hidden in the clue.
'ICE' is hidden within 'juicer'.
(Other definitions for ice that I've seen before include "Winter formation" , "Diamonds (colloq.)" , "Constituent of 2dn" , "Glaciate" , "Some number" .)