Crossword Genius

Fatal weakness (8,4)

Ross

I believe the answer is:

achilles heel

'fatal weakness' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for achilles heel that I've seen before include "Weak spot for attack" , "Vulnerable part" , "vulnerability" , "A chink in the armour" , "Small but fatal weakness" .)

I've seen this clue in The Telegraph and The Times.
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