Woolf in essence shows skill (7)
I believe the answer is:
finesse
'skill' is the definition.
(thesaurus)
'woolf in essence shows' is the wordplay.
'shows' indicates the answer is hidden within the clue.
'FINESSE' is hidden within 'woolf in essence'.
(Other definitions for finesse that I've seen before include "Subtle elegance" , "Impressive skill and delicacy" , "Subtlety of contrivance in cards" , "Tact and poise in handling situations" , "Artifice" .)