It's no good abandoning inexperienced or junior solver (3)
I believe the answer is:
you
This clue could be a double definition.
'it's' is the first definition.
(thesaurus)
'solver' is the second definition.
(the person solving the crossword)
'no good abandoning inexperienced or junior' is the link.
This may not be right. Some or all of it may belong to one of the definitions.
Can you help me to learn more?
(Other definitions for you that I've seen before include "Person speaker addresses" , "Thee" , "The audience as addressed by speaker" , "Anyone" , "Second-person pronoun" .)