Remove slate deposit (8)

I believe the answer is:

dislodge

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'remove' is the definition.
(I know that dislodge is a more specific form of the action remove)

'slate deposit' is the wordplay.
'slate' becomes 'dis' (I can't explain this - if you can you should give a lot more credence to this answer).
'deposit' becomes 'lodge' (synonyms).
'dis'+'lodge'='DISLODGE'

Can you help me to learn more?

(Other definitions for dislodge that I've seen before include "Move from a fixed position" , "Knock or force out of position" , "Drive away" , "Shift" , "Force from an established position" .)

I've seen this clue in The Independent.

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