Kit used for exploration, primarily, in sea? (5)
I believe the answer is:
scuba
This could be a double definition.
'kit used for exploration' is the first definition.
The definition and answer can be both man-made objects as well as being singular nouns.
I also know that 'exploration' relates to this answer.
'primarily in sea?' is the second definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
Can you help me to learn more?
(Other definitions for scuba that I've seen before include "Diving apparatus" , "Aqualung" , "Self-contained underwater breathing apparatus (acronym)" , "breather" , "Skin-diver's device" .)