Slide around cap (3)
I believe the answer is:
lid
'cap' is the definition.
(thesaurus)
'slide around' is the wordplay.
'around' indicates the answer is hidden within the clue.
'LID' can be found hidden inside 'slide'.
(Other definitions for lid that I've seen before include "Top or cover" , "Top crust of pie" , "Removable cover of a container" , "Pie crust; cover" , "Bottle or jar top" .)