Crossword Genius

Small cover moved smoothly (4)

Ross

I believe the answer is:

slid

'moved smoothly' is the definition.
(I've seen this before)

'small cover' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'cover' becomes 'lid' (lid is a kind of cover**).
's'+'lid'='SLID'

(Other definitions for slid that I've seen before include "Slipped" , "Moved smoothly along a surface" , "Moved (eg, on ice)" , "Skidded, slewed" .)

I've seen this clue in The Telegraph and The Mirror.
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