Attacked dwelling and was effective (6,4)

I believe the answer is:

struck home

'was effective' is the definition.

'attacked dwelling' is the wordplay.
'attacked' becomes 'struck' (striking is a kind of attacking).
'dwelling' becomes 'home' ('home' can be a synonym of 'dwelling').
'struck'+'home'='STRUCK HOME'

'and' is the link.

I've seen this clue in The Telegraph.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.