Unreal, being aboard sinking boat with Atlantis appearing anew? (13)
I believe the answer is:
insubstantial
'unreal' is the definition.
(I know that unreal can be written as insubstantial)
'aboard sinking boat with atlantis appearing anew?' is the wordplay.
I cannot quite see how this works, but
'aboard' could be 'in' (eg in a vehicle) and 'in' is present in the answer.
'boat' could be 'sub' (submarine) and 'sub' is found within the answer.
an anagram of 'atlantis' is 'stantial' which is within the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
'being' is the link.
Can you help me to learn more?
(Other definitions for insubstantial that I've seen before include "Tenuous" , "Flimsy" , "Meagre" , "Lacking solidity" .)