Maybe Glaswegian father evacuated estate without harm (4-4)
I believe the answer is:
scot-free
'without harm' is the definition.
(I've seen this before)
'maybe glaswegian father evacuated estate' is the wordplay.
'maybe glaswegian' becomes 'scot' (person from Glasgow, Scotland).
'father' becomes 'fr' (abbreviation as in a priest's title).
'evacuated' means to remove the middle letters.
'estate' with its centre removed is 'ee'.
'scot'+'fr'+'ee'='SCOT-FREE'
(Other definitions for scot-free that I've seen before include "(Get away) incurring no penalty" , "Unpunished, at liberty like Jock or Angus" , "(Get off) without punishment" , "Unharmed, not punished - like Angus at liberty?" , "Completely without penalty" .)