Quite a few leavers will be disturbed (7)

I believe the answer is:

several

I'm a little stuck... Click here to teach me more about this clue!

'quite a few' is the definition.
(I've seen this before)

'leavers will be disturbed' is the wordplay.
'leavers' anagrams to 'SEVERAL'.
However, I'm not clear how this is indicated.

Can you help me to learn more?

(Other definitions for several that I've seen before include "A good few" , "Divers" , "More than one or two" , "three or four" , "Some participants" .)

I've seen this clue in The Irish Independent.

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