Siren in collieries barely active after loss of current (7)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

An anagram (‘active’) of ‘[c]oll[i]erie[s]’ minus its outer letters CS (‘barely’) and minus an I (‘after loss of current’). Lorelei is a rocky outcrop on the banks of the Rhine, the site of many shipwrecks; it has been associated with a siren Lorelei, who by her beauty and singing has distracted sailors, thereby causing the wrecks.