Not prepared to study in a Parisian yard (7)
I believe the answer is:
unready
'not prepared' is the definition.
(I've seen this before)
'study in a parisian yard' is the wordplay.
'study' becomes 'read' ('read' can be a synonym of 'study').
'in' means one lot of letters goes inside another.
'a parisian' becomes 'un'.
'yard' becomes 'y'.
'un'+'y'='uny'
'read' placed within 'uny' is 'UNREADY'.
'to' is the link.
(Other definitions for unready that I've seen before include "Not prepared (like Ethelred?)" , "Ethelred, the ..., old English king" , "Disobedient in a scout" , "Ethelread the ..." , "Ill prepared" .)