It's shared among the family (7)
I believe the answer is:
kinship
'family' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.
'it's shared among' is the wordplay.
I cannot quite understand how this works, but
'among' could be 'in' (eg among or in a group) and 'in' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
'the' is the link.
Can you help me to learn more?
(Other definitions for kinship that I've seen before include "A sharing of characteristics" , "Close connection marked by interests, similarity in nature, or character" , "Affinity" , "Blood tie" , "Blood relationship" .)