Go for broke with forest where domestic growth high (4,6)
I believe the answer is:
roof garden
'where domestic growth high' is the definition.
(high garden)
'go for broke with forest' is the wordplay.
'broke' is an anagram indicator.
'with' means one lot of letters go next to another.
'forest' becomes 'arden' (Arden, forest in Shakespeare's As You Like It).
'go'+'for'='gofor'
'gofor' is an anagram of 'roofg'.
'roofg'+'arden'='ROOF-GARDEN'
(Other definitions for roof garden that I've seen before include "High-level greenery" , "that's grown at highest level" , "where domestic growth is highest" , "where domestic growth high?" , "Elevated area of greenery" .)