That crafty manner of mine (4)
I believe the answer is:
mien
'that crafty manner' is the definition.
I can't judge whether this definition defines the answer.
'of mine' is the wordplay.
'of' indicates anagramming the letters (the answer comes from or 'of' the letters).
'mine' is an anagram of 'MIEN'.
Can you help me to learn more?
(Other definitions for mien that I've seen before include "Comportment" , "The carriage" , "A countenance like mine" , "Counterance - mine?" , "Bearing, demeanour" .)