Trying to be touchy? (5)

I believe the answer is:

testy

I'm a little stuck... Click here to teach me more about this clue!

'be touchy?' is the definition.
(I've seen this in another clue)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for testy that I've seen before include "Quick to anger" , "likely to flare up?" , "Short-tempered" , "Easily irritated" , "Captious" .)

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