At home and abroad, to some extent (2,1,3)
I believe the answer is:
in a way
'to some extent' is the definition.
(I've seen this before)
'at home and abroad' is the wordplay.
'at home' becomes 'in' ('in' can be similar in meaning to 'at home').
'and' means one lot of letters go next to another.
'abroad' becomes 'away' (I've seen this before).
'in'+'away'='IN A WAY'
(Other definitions for in a way that I've seen before include "from one point of view" , "To some degree" , "From some points of view" , "Kind of" , "Sort of, in some respects" .)