Means to be heard, entertaining earl with improbable irony, perhaps (8)
I believe the answer is:
metallic
'irony perhaps' is the definition.
I can't judge whether this defines the answer.
'means to be heard entertaining earl with improbable' is the wordplay.
'means to be heard' becomes 'mic' (microphone).
'entertaining' means one lot of letters goes inside another (inviting in, as for dinner).
'earl' becomes 'e'.
'with' says to put letters next to each other.
'improbable' becomes 'tall' (synonyms).
'e'+'tall'='etall'
'mic' placed around 'etall' is 'METALLIC'.
Can you help me to learn more?
(Other definitions for metallic that I've seen before include "Call time (anag.)" , "This car paint say, gives a shiny surface" , "sound of a bell?" , "Of the nature of tin, iron, copper etc" , "Relating to shiny chemical element" .)