Nowadays, a choice in family planning (8)
I believe the answer is:
adoption
'family planning' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'nowadays a choice' is the wordplay.
'nowadays' becomes 'ad'.
'a choice' becomes 'option' ('option' can be a synonym of 'choice').
'ad'+'option'='ADOPTION'
'in' is the link.
Can you help me to learn more?
(Other definitions for adoption that I've seen before include "how to create a family" , "Endorsement" , "means to increase size of family?" , "Acceptance (of, eg, a report)" , "Taking on another's child as one's own" .)