Selection boxes -- cold and small, sweet treats (4-4)

'sweet treats' is the definition.
(type of sweet food)

'selection boxes cold and small' is the wordplay.
'selection' becomes 'choice' (synonyms).
'boxes' means one lot of letters goes inside another (the outside letters must 'box' inside letters in).
'cold' becomes 'c' (eg on taps).
'and' is a charade indicator (letters next to each other).
'small' becomes 's' (abbreviation - e.g. clothes size).
'choice' placed around 'c' is 'chocice'.
'chocice'+'s'='CHOC-ICES'