Very disappointed (4,2,1,6)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">very disappointed</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for sick as a parrot that I've seen before include "Really gutted" , "Severely disappointed" , "badly gutted" , "Extremely disappointed (colloq.)" , "Awfully disappointed" .)
(Other definitions for crestfallen that I've seen before include "Dejected after blow to pride" , "Downcast" , "in a sorry condition" , "Feeling a blow to one's pride" , "Sadly disappointed" .)
(Other definitions for gutted that I've seen before include "Destroyed internally, as building by fire" , "Disembowelled or destroyed by fire" , "He may be left when horse is" , "extremely upset" , "Emptied; upset" .)