Fish to catch fresh eels: it's unjustified (8)
I believe the answer is:
baseless
'unjustified' is the definition.
Both the definition and answer are adjectives. Perhaps there's a link between them I don't understand?
'fish to catch fresh eels' is the wordplay.
'fish' becomes 'bass' (bass is a kind of fish).
'to catch' indicates putting letters inside.
'fresh' indicates an anagram.
'eels' with letters rearranged gives 'sele'.
'bass' placed around 'sele' is 'BASELESS'.
'it's' acts as a link.
Can you help me to learn more?
(Other definitions for baseless that I've seen before include "Lacking foundation, as rumours may" , "like a bed with just a mattress?" , "Wrong, as a matter of fact" , "Idle" , "Without foundation, unsupported" .)