lovatts colossus cryptic 134

Stuck on the last 3

6 down( caves in at rat packs inclusion of frank) i have s?n?t??
19 accross (Get rid of bugs) s??i?i?e Is it sanitise?
56 down (Bears sighted on the edges road) ?h??l?e?s is it shoulders?

Thanks in advance can't seem to think straight or cryptic today and running out of time to post my entry