Covertly displacing crown, won't ambassador question groundless treason? (2,3,2)

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

deleting the first of (displacing crown) wON’T + HE (His Excellency, ambassador) + Q (question) + Treason with ‘reason’ deleted (ground-less). From ‘ on the quiet’ or secretly.