Decided to add modern light to beastly home (7)
I believe the answer is:
settled
'decided' is the definition.
('settle' can be a synonym of 'decide')
'light to beastly home' is the wordplay.
'light' becomes 'led' (abbreviation for light emitting diode).
'to' means one lot of letters go next to another (I've seen this in other clues).
'beastly home' becomes 'sett' (a sett is a badger's burrow).
'led' after 'sett' is 'SETTLED'.
'to add modern' is the link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for settled that I've seen before include "Resolved (an argument)" , "Came down; resolved" , "came to agreement" , "Resolved; calm" , "Put down roots; decided" .)