Location, near Hackney, of Gladstone's change of heart (7)
I believe the answer is:
dalston
'change of heart' is the definition.
The definition suggests a singular noun which matches the answer.
'location near hackney of gladstone's' is the wordplay.
I cannot really see how this works, but
'near' could be 'to' (to can mean near or close to) and 'to' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Another definition for dalston that I've seen is " area of East London".)