Small jump to the store (4)
I believe the answer is:
shop
'the store' is the definition.
('shop' can be a synonym of 'store')
'small jump' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'jump' becomes 'hop' (hop is a kind of jump).
's'+'hop'='SHOP'
'to' is the link.
(Other definitions for shop that I've seen before include "Retail premises" , "Store, outlet" , "Establishment for the sale of goods" , "Inform on (slang)" , "sales outlet" .)