It gets a bit touchy and irritating (5)
I believe the answer is:
itchy
'irritating' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for itchy that I've seen before include "Bothersome" , "Suffering from a rash?" , "Tingling - desirous" , "Having a desire to scratch" , "Like the feet of the restless" .)