With 121-Across, company that sells scuba gear (4)
I believe the answer is:
aqua
(Other definitions for aqua that I've seen before include "Hue" , "shade" , "which supports boats?" , "Water; pale blue colour" , "Prefix denoting "water"" .)
I believe the answer is:
aqua
(Other definitions for aqua that I've seen before include "Hue" , "shade" , "which supports boats?" , "Water; pale blue colour" , "Prefix denoting "water"" .)