One isn't shaken though it may make one shake (7)
I believe the answer is:
tension
'it may make one shake' is the definition.
The definition suggests a singular noun which matches the answer.
'one isn't shaken' is the wordplay.
'shaken' indicates anagramming the letters.
'one'+'isnt'='oneisnt'
'oneisnt' with letters rearranged gives 'TENSION'.
'though' is the link.
Can you help me to learn more?
(Other definitions for tension that I've seen before include "anxious state" , "Nervous strain" , "Uneasiness" , "Intones (anag) - stress" , "Assay" .)