Crossword Genius

Another Leeson rattling a few English banks (7,4)

Ross

I believe the answer is:

someone else

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'another' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'leeson rattling a few english banks' is the wordplay.
'rattling' is an anagram indicator.
'a few' becomes 'some' (both can mean a small amount of something).
'english' becomes 'e' (abbreviation).
'banks' is an insertion indicator (bank can mean to surround or border).
'some'+'e'='somee'
'leeson' anagrammed gives 'oneels'.
'oneels' going into 'somee' is 'SOMEONE ELSE'.

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I've seen this clue in The Independent.
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