At home, and abroad to some extent (2,1,3)
I believe the answer is:
in a way
Here is my best explanation:
'to some extent' is the definition.
(I've seen this before)
'at home and abroad' is the subsidiary indication.
'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).
(Other definitions for in a way that I've seen before include "somehow", "To some degree", "as one might see it", "from one point of view", "Kind of", "From some points of view", "Sort of, in some respects", "To a certain extent", "Sort of, to a limited extent" and "In some respects, sort of".)