Crossword Genius

Slipped on small cover (4)

Ross

I believe the answer is:

slid

'slipped' is the definition.
('slide' can be a synonym of 'slip')

'on small cover' is the wordplay.
'on' says to put letters next to each other.
'small' becomes 's' (abbreviation - e.g. clothes size).
'cover' becomes 'lid' (lid is a kind of cover).
's' next to 'lid' is 'SLID'.

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

I've seen this clue in The Mirror.
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