Without it magic trick becomes tawdry (8)
I believe the answer is:
gimcrack
'tawdry' is the definition.
(I know that tawdry can be written as gimcrack)
'without it magic trick becomes' is the wordplay.
'without' is a deletion indicator.
'becomes' indicates an anagram.
'magic'+'trick'='magictrick'
'magictrick' with 'it' taken away is 'magcrick'.
'magcrick' is an anagram of 'GIMCRACK'.
(Other definitions for gimcrack that I've seen before include "Cheap and unreliable" , "Of ornament, showy but worthless" , "Tinpot" , "Cheap and shoddy" , "poorly-made article" .)