Frail head going round food shop (12)
I believe the answer is:
Here is my best explanation:
'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'.