Spot what some would see as a seaside street treat (5)
I believe the answer is:
whelk
'treat' is the definition.
The answer and definition can be both things that one consumes for nourishment as well as being singular nouns.
Maybe they are linked in a way I don't understand?
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for whelk that I've seen before include "Shellfish" , "Edible marine snail" , "Sea snail" , "Carnivorous mollusc" , "Spiral-shelled mollusc" .)