Chilled home brew before unknown film (3,4,2,4)

'film' is the definition.
(Ice Cold in Alex is a 1958 film)

'chilled home brew before unknown' is the wordplay.
I cannot quite see how this works, but
'chilled' could be 'icecold' (I've seen this before) and 'icecold' is located in the answer.
'home' could be 'in' ('he's home' can mean 'he's in') and 'in' is found in the answer.
'brew' could be 'ale' (ale is a kind of brew) and 'ale' is found within the answer.
'unknown' could be 'x' (algebra) and 'x' is located in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?