Informal talk of many a kind (3)

I believe the answer is:
yak
'informal talk' is the definition.
'yak' can be an answer for 'talk' (yak is a kind of talk). I am not sure about the 'informal' bit.
'of many a kind' is the wordplay.
'of' says the answer is hidden in the clue.
'YAK' is hidden in the letters of 'many a kind'.
Can you help me to learn more?
(Other definitions for yak that I've seen before include "Persistent talk" , "Wild ox" , "Hairy Tibetan ox" , "Tibetan ox - chatter" , "Species of ox" .)
