Some say poor design put up is limp (6)
I believe the answer is:
droopy
'limp' is the definition.
(I've seen this before)
'some say poor design put up' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'put up' is a reversal indicator.
'ypoord' is hidden in the letters of 'say poor design'.
'ypoord' written backwards gives 'DROOPY'.
'is' is the link.
(Other definitions for droopy that I've seen before include "Limp" , "Inclined to sag" , "Pessimistic, long-eared cartoon dog" , "Hanging loose" , "Hanging limply - animated dog created by Tex Avery" .)