Small women's group with case of supplies, bread and cake (5,4)
I believe the answer is:
swiss roll
'cake' is the definition.
(I've seen this before)
'small women's group with case of supplies bread' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'women's group' becomes 'wi' (Women's Institute).
'with' says to put letters next to each other.
'case of' suggests removing the centre (outsides of).
'bread' becomes 'roll' (roll is a kind of bread).
'supplies' with its middle taken out is 'ss'.
's'+'wi'+'ss'+'roll'='SWISS-ROLL'
'and' acts as a link.
(Other definitions for swiss roll that I've seen before include "Filled sponge cake" , "Type of sponge cake" , "Somehow sponge" , "teatime treat?" , "Cylindrical sponge cake with layers of jam" .)