Cup presented wrongly to a lazy person (6)
I believe the answer is:
potato
'lazy person' is the definition.
'cup presented wrongly to a' is the wordplay.
'cup presented' becomes 'pot'.
'wrongly' indicates anagramming the letters (I've seen this in other clues).
'to'+'a'='toa'
'toa' anagrammed gives 'ato'.
'pot'+'ato'='POTATO'
(Other definitions for potato that I've seen before include "Murphy (informal)" , "Would be difficult to deal with if hot" , "Tuber, popular in Ireland" , "The vegetable is too apt, oddly" , "Plant tuber eaten as a vegetable" .)