Facility needing spades to finish off (5)
I believe the answer is:
skill
'facility' is the definition.
(thesaurus)
'spades to finish off' is the wordplay.
'spades' becomes 's' (abbreviation in card games).
'to finish off' becomes 'kill'.
's'+'kill'='SKILL'
'needing' is the link.
(Other definitions for skill that I've seen before include "Aptitude" , "Special ability" , "Talent" , "Expertise, dexterity" , "facility" .)