Possible you are getting picked up for nothing -- tough! (7)
I believe the answer is:
durable
'tough' is the definition.
(thesaurus)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for durable that I've seen before include "Firm" , "Likely to last" , "existing for a long time" , "Good" , "Made to last" .)