Frail head going round food shop (12)
I believe the answer is:
delicatessen
'food shop' is the definition.
('delicatessen' can be a synonym of 'food shop')
'frail head going round' is the wordplay.
'frail' becomes 'delicate' ('delicate' can be a synonym of 'frail').
'head' becomes 'ness' (ness is a headland).
'going round' shows that the letters should be reversed in order.
'ness' written backwards gives 'ssen'.
'delicate'+'ssen'='DELICATESSEN'
(Other definitions for delicatessen that I've seen before include "Here one gets exotic foods" , "Seller of fine foods" , "food store?" , "Fine foods shop" , "Specialised food shop" .)