Remove obscurity from the screen (6)

I believe the answer is:

demist

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'screen' is the definition.
Although both the answer and definition are verbs in their base form, I don't see how they can define each other.

'remove obscurity' is the wordplay.
'remove' becomes 'de' (I've seen this in other clues).
'obscurity' becomes 'mist'.
'de'+'mist'='DEMIST'

'from the' acts as a link.

Can you help me to learn more?

(Another definition for demist that I've seen is " Clear condensation from".)

I've seen this clue in The Irish Independent.

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