People separating to secure new significant others (8)
I believe the answer is:
partners
'people' is the definition.
(partner is a kind of person)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for partners that I've seen before include "They share in an activity, business or marriage" , "Close associates in business or life" , "Companions or associates" , "Business or marital mates" .)