Sample of holidays in Cork (3)
I believe the answer is:
lid
'cork' is the definition.
(thesaurus)
'sample of holidays in' is the wordplay.
'sample of' indicates the answer is hidden within the clue (I've seen this in other clues).
'LID' is hidden in the letters of 'holidays in'.
(Other definitions for lid that I've seen before include "Cover for box or pot" , "Kind of cover, may be hinged" , "Top or cover" , "Hinged or removable cover as for bottle" , "Cover as for jar" .)