Containers used at two points? (4)
I believe the answer is:
bins
'containers' is the definition.
(bin is a kind of container)
'at two points?' is the wordplay.
'two points?' can mean two replacements for 'points?'.
'at' is a charade indicator (letters next to each other).
'points?' becomes 'bi' (I am not sure about this - if you are sure you should believe this answer much more).
'points?' becomes 'ns' (two compass points).
'bi'+'ns' is 'BINS'.
'used' is the link.
Can you help me to learn more?
(Other definitions for bins that I've seen before include "Rubbish receptacles" , "aid to viewing" , "Rejects" , "Containers for refuse" , "Containers for wine or rubbish" .)