I had several not-very-clinical jobs when I graduated from my Master's (I worked as a field researcher and a caregiver for late-stage dementia patients...kinda clinical but mostly just assisting with living stuff). Do whatever you need to finance your life and app cycle. I work in a clinical job now, and I really, really miss my double paycheck from those days now that I'm doing secondaries. As long as you stay involved in hospital volunteering I'd say you're good.