At this point land appears! (3,5)
I believe the answer is:
sea level
'at this point land appears' is the definition.
The answer and definition can be both human attributes as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'at this point' is the wordplay.
'at' becomes 'sea' (I am not sure about this - if you are sure you should believe this answer much more).
'this point' becomes 'level' (synonyms).
'sea'+'level'='SEA-LEVEL'
Can you help me to learn more?
(Other definitions for sea level that I've seen before include "It's used in reckoning land elevation" , "0 feet?" , "Altitude reference point" , "Standard for measuring map heights" , "Base from which height of aircraft is measured" .)