Very apparent to many a listener (5)
I believe the answer is:
clear
'very apparent' is the definition.
'clear' can be an answer for 'apparent' ('clear' can be a synonym of 'apparent'). I'm not sure about the 'very' bit.
'many a listener' is the wordplay.
'many a' becomes 'cl' (I am not sure about this - if you are sure you should believe this answer much more).
'listener' becomes 'ear' (I've seen this before).
'cl'+'ear'='CLEAR'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for clear that I've seen before include "Unimpeded" , "bound over" , "School near Windsor" , "Unambiguous" , "Comprehensible" .)