To many a listener, easily understandable (5)

I believe the answer is:

clear

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'understandable' is the definition.
(similar in meaning)

'to many a listener easily' is the wordplay.
'to many' becomes 'c' (C is the Roman numeral for l00).
'a listener easily' becomes 'lear' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'c'+'lear'='CLEAR'

Can you help me to learn more?

(Other definitions for clear that I've seen before include "Acquit" , "Free from blame" , "Not obstructed" , "Patent" , "beyond doubt" .)

I've seen this clue in the Evening Standard.

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