After Chuck Berry's lover settles with the related singers (6,8)

I believe the answer is:

everly brothers

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'after chuck' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'berry's lover settles with the related singers' is the wordplay.
'settles with' is an anagram indicator (I've seen 'settled' mean this).
'related singers' becomes 's' (I can't explain this - if you can you should give a lot more credence to this answer).
'berry'+'lover'='berrylover'
'berrylover' anagrammed with 'the' makes 'everlybrother'.
'everlybrother'+'s'='EVERLY BROTHERS'

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I've seen this clue in The Independent.

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