Criticise tourists on vacation? Rubbish! (5)
I believe the answer is:
pants
'rubbish' is the definition.
(informal term meaning poor-quality)
'criticise tourists on vacation?' is the wordplay.
'criticise' becomes 'pan' (informal term meaning to criticise heavily).
'on vacation?' says to hollow out the word (remove centre letters) (I've seen 'on vacation' mean this).
'tourists' with its centre removed is 'ts'.
'pan'+'ts'='PANTS'
(Other definitions for pants that I've seen before include "Shorts" , "Briefs" , "longs" , "Bloomers" , "Knickers" .)