Crossword Genius

Need a month off around the beginning of summer even more (3,4,4)

Ross

I believe the answer is:

and then some

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'even more' is the definition.
Both the definition and answer are adverbs. Perhaps they are linked in a way I don't understand?

'need a month off around the beginning of summer' is the wordplay.
'off' indicates anagramming the letters.
'around' is an insertion indicator.
'the beginning of' suggests taking the first letters.
The first letter of 'summer' is 's'.
'need'+'a'+'month'='needamonth'
'needamonth' with letters rearranged gives 'andthenome'.
'andthenome' enclosing 's' is 'AND THEN SOME'.

Can you help me to learn more?

(Another definition for and then some that I've seen is " With plenty more in addition".)

I've seen this clue in The Independent.
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