This will prickle the back (5)
I believe the answer is:
spine
This clue could be a double definition.
'this will prickle' is the first definition.
'spine' can be an answer for 'prickle' (synonyms). I am unsure of the 'this will' bit.
'back' is the second definition.
(I know that back can be written as spine)
'the' is the link.
Can you help me to learn more?
(Other definitions for spine that I've seen before include "Backbone" , "Series of vertebrae" , "Vertebrae, complete" , "Strength of character" , "Line of vertebrae" .)