Curb faculty, having the power to do so (10)
I believe the answer is:
capability
'curb faculty' is the definition.
'capability' can be an answer for 'faculty' (thesaurus). I'm not certain of the 'curb' bit.
'the power to do so' is the wordplay.
'the power' becomes 'ability' ('ability' can be a synonym of 'power').
'to' means one lot of letters go next to another (I've seen this in other clues).
'do so' becomes 'cap' (I can't justify this - if you can you should believe this answer much more).
'ability' put after 'cap' is 'CAPABILITY'.
'having' acts as a link.
Can you help me to learn more?
(Other definitions for capability that I've seen before include "lord with big estate?" , "So-called gardener" , "Potential problem-solver" , "Competence" , "Power (to do something)" .)