Regular couple in Delft provide current address (7)
I believe the answer is:
effendi
'address' is the definition.
(I have seen 'respectable address' mean 'effendi' so perhaps 'address' could also mean 'effendi')
'regular couple in delft provide current' is the wordplay.
I cannot really understand how this works, but
'couple' could be 'eff' (effing is a kind of coupling) and 'eff' is found within the answer.
'current' could be 'i' (symbol for electric current) and 'i' is present in the answer.
The remaining letters 'end' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for effendi that I've seen before include "Eastern Mediterranean honorific" , "Turkish man respectfully" , "Turkish address now comparable to 'Mr'" , "Learned Arab" , "respectable address" .)