A bit of sugar is hardly tasteless (6)
I believe the answer is:
garish
'tasteless' is the definition.
(similar in meaning)
'a bit of sugar is hardly' is the wordplay.
'a bit of' indicates the answer is hidden within the clue.
'GARISH' can be found hidden inside 'sugar is hardly'.
(Other definitions for garish that I've seen before include "Bright and showy" , "Gaudy and tasteless" , "Excessively bright, over-colourful (6)" , "in bright colours" , "Cheap, flashy" .)