Present opportunities are in store here (4,4)
I believe the answer is:
gift shop
'here' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'present opportunities are in store' is the wordplay.
I cannot really understand how this works, but
'present' could be 'gift' (synonyms) and 'gift' is present in the answer.
'store' could be 'shop' (synonyms) and 'shop' is found in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
(Other definitions for gift shop that I've seen before include "Where to buy presents" , "Store through which you are forced to pass on the way out?" , "Present store?" , "Where to buy souvenirs" , "part of most museums?" .)