Take in or take on (5)
I believe the answer is:
adopt
This clue is a double definition.
'take in' is the first definition.
(I know that take in can be written as adopt)
'take on' is the second definition.
(I know that take on can be written as adopt)
(Other definitions for adopt that I've seen before include "make one's own" , "Choose as one's own" , "Take up, follow" , "Embrace" , "Acquire" .)