Order in shop: husband out for seafood (7)
I believe the answer is:
scallop
'seafood' is the definition.
(scallop is a kind of seafood)
'order in shop husband out' is the wordplay.
'order' becomes 'call' (calling is a kind of ordering).
'in' indicates putting letters inside.
'husband' becomes 'h'.
'out' suggests deleting specific letters.
'shop' with 'h' taken out is 'sop'.
'call' going within 'sop' is 'SCALLOP'.
'for' is the link.
(Other definitions for scallop that I've seen before include "Shell - sign of a pilgrim" , "Marine mollusc" , "Shellfish - badge worn by pilgrims to Santiago de Compostela" , "Bivalve mollusc with fan-shaped shell" , "Mollusc or lacy edge" .)