Garland's original Eastern holiday (7)
'holiday' is the definition.
(thesaurus)
'garland's original eastern' is the wordplay.
'garland's' becomes 'leis' ('lei' can be a synonym of 'garland').
'original' becomes 'ur'.
'eastern' becomes 'e'.
'leis'+'ur'+'e'='LEISURE'
(Other definitions for leisure that I've seen before include "days off" , "idle hours" , "Time away from work" , "Convenient opportunity" , "Time when not working" .)
But I've got no explanation for this one! Could you help me understand?