. . . dashed into Cooper's Farm Feed Store? (7)
I believe the answer is:
granary
'farm feed store?' is the definition.
(a granary stores grain)
'dashed into cooper's' is the wordplay.
'dashed' becomes 'ran' (I've seen this in another clue).
'into' indicates putting letters inside.
'cooper' becomes 'gary' (actor Gary Cooper).
'ran' going within 'gary' is 'GRANARY'.
(Other definitions for granary that I've seen before include "Store for corn etc" , "Storehouse for wheat or corn, say" , "Store for, eg, corn" , "(Of bread) containing whole grains of wheat" , "Harvest store" .)