Register seven terraced houses (5)
I believe the answer is:
enter
'register' is the definition.
(I know this)
'seven terraced houses' is the wordplay.
'houses' says the answer is hidden in the clue (part of the clue houses the answer).
'ENTER' is hidden within 'seven terraced'.
(Other definitions for enter that I've seen before include "Break in" , "Come in - register" , "put in for a race" , "Come in - penetrate - record" , "Get in" .)