Huge blunder, with Italy and France consumed by evidence of tension (8)
I believe the answer is:
terrific
'huge' is the definition.
(I've seen this before)
'blunder with italy and france consumed by evidence of tension' is the wordplay.
I cannot really see how this works, but
'blunder' could be 'err' (I've seen this in other clues) and 'err' is found in the answer.
'italy' could be 'i' and 'i' is found in the answer.
'france' could be 'f' and 'f' is located in the answer.
'evidence' could be 'tic' (tic is a kind of evidence) and 'tic' is found within the remaining letters.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for terrific that I've seen before include "Super, really great" , "frightening" , "'Marvellous, wonderful (8)'" , "Of great size/intensity" , "Splendid" .)