according to big daves blog:
5d 'I don’t belieeeeve it!’ — funny: this is Victor, remember! (6,2,7)
{SHIVER ME TIMBERS} – this expression which is similar to “I don’t belieeeeve it!” is an anagram (funny) of THIS IS V(ictor) REMEMBER
29a Setting reverses such anagrams signify (9)
{OSSIFYING} A lovely word that means setting or solidifying to bone is found by reversing a short word for such and adding an anagram of SIGNIFY,
13a & 12a … and it’s me admitting error! (1,5,9)
{I STAND CORRECTED} A cryptic definition of an expression uttered when a mistake is pointed out to someone.
http://bigdave44.com/2011/12/02/toughie-678/