The term 'STUNNING BLOW' can be broken down into two words, 'STUNNING' and 'BLOW'. The crossword solution for the term is FACER, which is a five letter word. FACER is a term used in sports, particularly cricket, to describe a ball that is bowled directly at the batsman's face. This type of delivery is considered to be a very aggressive move and can be quite intimidating for the batsman. A STUNNING BLOW is thus a powerful and intimidating delivery that is bowled directly at the batsman's face.