Foil that lacks a wrapping action (6)
I believe the answer is:
thwart
'foil' is the definition.
('thwart' can be a synonym of 'foil')
'that lacks a wrapping action' is the wordplay.
'lacks' suggests deleting specific letters.
'wrapping' is an insertion indicator.
'action' becomes 'war' (war is a kind of action**).
'that' with 'a' taken out is 'tht'.
'tht' going around 'war' is 'THWART'.
(Other definitions for thwart that I've seen before include "Hinder or prevent" , "check" , "Frustrate and obstruct" , "Stymie" , "cross" .)