What The Guardian offers with bizarre glee, stifling a disapproving comment at first (8)

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

[ Anagram of ( bizarre ) GLEE containing ( stifling ) A ] placed after ( … at first ) TUT(or tut-tut, a disapproving comment/exclamation). Defn: …, in this case, the guardian of a ward.