Dexterity left foot lacked, in a sense (7)
I believe the answer is:
sleight
'dexterity' is the definition.
(I know that dexterity can be written as sleight)
'lacked in a sense' is the wordplay.
'lacked' becomes 'le' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'in' is an insertion indicator.
'a sense' becomes 'sight' (sight or vision is a sense).
'le' put within 'sight' is 'SLEIGHT'.
'left foot' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for sleight that I've seen before include "Artful trick" , "It's deceiving to the eye" , "Manual dexterity" , "craft" , "Conjuror uses this" .)