Reinstating expired security clearance
Asking for a friend going through a divorce. Her husband previously worked as a signals intelligence instructor for the Army as a contractor. He left that career around 2017 to stay home with the kids. He has told her his Top Secret clearance expired and that it's too expensive/difficult to reinstate outside of active employment.
She's trying to understand if his current underemployment (~$12/hr) reflects his actual earning capacity or a choice, as it may affect child support calculations.
Questions:
How difficult is it to reinstate an expired TS clearance with a signals intelligence background?
Is it true it can only be reinstated through an employer?
What would realistic earning potential look like if he pursued contractor work again?
Any insight from people with clearance experience appreciated.