Lights outside the house would be the answer (7)
I believe the answer is:
beacons
'lights' is the definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Perhaps they are linked in a way I don't understand?
'outside the house would be the answer' is the wordplay.
I cannot quite understand how this works, but
'be' is present in the answer.
'answer' could be 'a' (abbreviation eg in Q and A) and 'a' is found within the answer.
'the house' could be 'co' (I've seen this in other clues) and 'co' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for beacons that I've seen before include "Warning or guiding devices for ships" , "Signal fires" .)