Teenage gamine periodically sought for modelling contract (10)
I believe the answer is:
engagement
'contract' is the definition.
(thesaurus)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for engagement that I've seen before include "calls for signs of commitment" , "promise of union" , "Ring maybe to confirm this" , "Date, battle, or betrothal" , "fighting" .)