Pastel hue (4)
'pastel hue' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for aqua that I've seen before include "which supports boats?" , "shade" , "Prefix denoting "water"" , "- Regia; - fortis" , "(Denoting) water (Lat)" .)
(Other definitions for pink that I've seen before include "Pale red" , "punch" , "prick" , "somewhat to the left?" , "See 21" .)