Man, perhaps, is 50+? (6)
I believe the answer is:
island
'man perhaps' is the definition.
(Isle of Man is an example)
'is 50?' is the wordplay.
'50?' becomes 'land' (I can't justify this - if you can you should give a lot more credence to this answer).
'is'+'land'='ISLAND'
Can you help me to learn more?
(Other definitions for island that I've seen before include "Piece of land smaller than a continent" , "Tract surrounded by water" , "Eg, Crete" , "area adjacent to water" , "It could follow desert, coral, thousand or traffic" .)