Store Tesco’s opening in Berkshire perhaps (4)
I believe the answer is:
stew
'store' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'tesco's opening in berkshire perhaps' is the wordplay.
'opening' suggests taking the first letters.
'in' is an insertion indicator.
'berkshire perhaps' becomes 'sew' (I can't justify this - if you can you should give a lot more credence to this answer).
The initial letter of 'tesco' is 't'.
't' going into 'sew' is 'STEW'.
Can you help me to learn more?
(Other definitions for stew that I've seen before include "Casserole" , "Dish cooked in a pot" , "Ragout or burgoo" , "hotpot" , "Dish of meat and mixed vegetables" .)