Adoptive

4 clues
Kind of parent
Certain parents
Like some parents
Like Clark Kent's parents
Similar answers:
Abideceptivepitch
Ablative
Abnegative
Abortive
Abouttoadopt
Abpositive
Absorptive
Abuyablealternative
Accountexecutive
Accretive
Accusativecase
Acquisitive
Acquisitiveness
Active
Activecase
Activecomponent
Activeduty
Activeinterests
Actively
Activeplay