I'm crafty about being so repulsive! (5)
I believe the answer is:
slimy
'so repulsive' is the definition.
'slimy' can be an answer for 'repulsive' (thesaurus). I'm not sure about the 'so' bit.
'i'm crafty about' is the wordplay.
'crafty' becomes 'sly' (synonyms).
'about' indicates putting letters inside.
'im' inserted inside 'sly' is 'SLIMY'.
'being' acts as a link.
Can you help me to learn more?
(Other definitions for slimy that I've seen before include "Glutinous" , "Moist and slippery" , "Covered with slippery stuff, say mud" , "toadying" , "Oleaginous" .)