Pale small sorceress is dimmer (5,6)

I believe the answer is:

light switch

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'dimmer' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'pale small sorceress' is the wordplay.
'pale' becomes 'light' (similar in meaning).
'small' becomes 's' (abbreviation - e.g. clothes size).
'sorceress' becomes 'witch' (synonyms).
'light'+'s'+'witch'='LIGHT SWITCH'

'is' is the link.

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I've seen this clue in The Mirror.

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