2185: Over the sea — and bridge

Two unclued lights describe the location of the others, individually or as a pair. One of these unclued lights does double duty. One square must contain a beetle showing possible alternatives to one of the unclued lights.
 

Across

11    Tipsy grannie raking it in (7)
12    Skilling worker put sign outside (6, hyphened)
16    Noble cut out mink (5)
19    In bed, off work (7)
21    First half of expedition to Spain is risk-free (4)
23    Continue to rush doctor (7)
24    Land mass is reflected volcanic...