A sliding cover? (3)

I believe the answer is:

lid

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'a sliding cover?' is the definition.
'lid' can be an answer for 'cover?' (lid is a kind of cover). I am not sure about the 'a sliding' bit.

'sliding cover?' is the wordplay.
'cover?' says the answer is hidden in the clue (I've seen 'covering' mean this).
'LID' can be found hidden inside 'sliding'.

Can you help me to learn more?

(Other definitions for lid that I've seen before include "Movable cover" , "Removable top" , "Pie crust; cover" , "Receptacle cover" , "Hat" .)

I've seen this clue in the Evening Standard.

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