Cry when I design (5)
I believe the answer is:
whine
'cry' is the definition.
(thesaurus)
'when i design' is the wordplay.
'design' is an anagram indicator.
'when'+'i'='wheni'
'wheni' is an anagram of 'WHINE'.
(Other definitions for whine that I've seen before include "Nagging complaint" , "Moan" , "Complain peevishly" , "carp" , "beef?" .)