Plug type of wheat soap less accepted abroad (8)

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

Plug type of wheat soap less accepted abroad *(WHEAT SO <a> P ); “ less accepted (=a) ” means letter “a” is dropped from anagram, indicated by “abroad”; a two-phase electrical device is one employing two phases whose voltages are displaced from another by ninety electrical degrees