Hit Scotsman over pinching bishop's instrument (5,5)

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

THUMP (hit) + IAN (Scotsman) + O (over), containing [pinching] B (bishop). Also called ‘mbira’ or ‘sansa’ this is a musical instrument of southern Africa consisting of a set of keys or tongues attached to a resonator, which are plucked with the thumb and forefingers. (SOED). I never heard of it. All searches on YouTube return music for the kalimba which seems to another name for it, or a very similar instrument