Rubbish in statistics (3)
I believe the answer is:
tat
'rubbish' is the definition.
(tat can mean rubbish or poor-quality material)
'in statistics' is the wordplay.
'in' indicates a hidden word.
'TAT' is hidden within 'statistics'.
(Other definitions for tat that I've seen before include "Inferior articles" , "Tawdry and shabby article" , "Worthless items" , "Shoddy articles" , "Utterly tasteless objects" .)