One getting stuck into new Listener that's tough (9)
I believe the answer is:
resilient
'tough' is the definition.
(I've seen this before)
'one getting stuck into new listener' is the wordplay.
'one' becomes 'i' (Roman numeral).
'getting stuck into' is an insertion indicator.
'new' indicates an anagram.
'listener' anagrammed gives 'resilent'.
'i' put inside 'resilent' is 'RESILIENT'.
'that's' is the link.
(Other definitions for resilient that I've seen before include "Rebounding quickly" , "Able to bounce back from adversity" , "Rebounding from impact" , "recovering easily from shock" , "Tough" .)