Being a judge is difficult (6)
I believe the answer is:
trying
'difficult' is the definition.
(similar in meaning)
'being a judge' is the wordplay.
I cannot really see how this works, but
'judge' could be 'try' (as in trialling a defendant) and 'try' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
'is' is the link.
Can you help me to learn more?
(Other definitions for trying that I've seen before include "Vexatious - having a go" , "Essaying" , "Annoying; sampling" , "Attempting or stretching patience to the limit" , "Tiresome" .)