Trickery from the French in great deal (7)
I believe the answer is:
sleight
'trickery' is the definition.
(as in sleight of hand)
'the french in great deal' is the wordplay.
'the french' becomes 'le' ('the' in French).
'in' is an insertion indicator.
'great deal' becomes 'sight' (synonyms).
'le' placed into 'sight' is 'SLEIGHT'.
'from' is the link.
(Other definitions for sleight that I've seen before include "Conjuror uses this" , "distraction?" , "Artful trick" , "Cunning action" , "It's deceiving to the eye" .)