Can require some heating (3)
I believe the answer is:
tin
'can' is the definition.
('tin' can be a synonym of 'can')
'some heating' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'TIN' is hidden within 'heating'.
'require' is the link.
I am not very happy about this link. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for tin that I've seen before include "Silvery-white metallic element" , "Earnings" , "Cornish metal?" , "A silvery-white metal often in cans" , "Light metal" .)