Open dress I fancy showing dimple (10)
I believe the answer is:
depression
'dimple' is the definition.
(thesaurus)
'open dress i fancy' is the wordplay.
'fancy' is an anagram indicator.
'open'+'dress'+'i'='opendressi'
'opendressi' anagrammed gives 'DEPRESSION'.
'showing' is the link.
(Other definitions for depression that I've seen before include "mental anguish" , "Blues" , "despair" , "Bad times" , "gloom" .)