Being crafty, you finish in a terrible state (6)
I believe the answer is:
astute
'being crafty' is the definition.
(thesaurus)
'you finish in a terrible state' is the wordplay.
'finish' says to take the final letters.
'in' means one lot of letters goes inside another.
'a terrible' is an anagram indicator.
The last letter of 'you' is 'u'.
'state' anagrammed gives 'astte'.
'u' going within 'astte' is 'ASTUTE'.
(Other definitions for astute that I've seen before include "Statue (anag)" , "Nymph who was transformed into a laurel tree to escape Apollo" , "Sharp and clever" , "Wise" , "smart (with some self-interest?)" .)