Slide into desk, ideally (4)
I believe the answer is:
skid
'slide' is the definition.
(I know that skid is a type of slide)
'into desk ideally' is the wordplay.
'into' indicates a hidden word.
'SKID' is hidden within 'desk ideally'.
(Other definitions for skid that I've seen before include "What car may do on ice - be careful" , "Runn" , "Slide at an angle" , "Slide fast" , "potential cause of accident" .)