Convert nine plus a projection of land (9)
I believe the answer is:
peninsula
'projection of land' is the definition.
'peninsula' can be an answer for 'land' (peninsula is a kind of land). I am not sure about the 'projection of' bit.
'convert nine plus a' is the wordplay.
'convert' is an anagram indicator (I've seen this in other clues).
'nine'+'plus'='nineplus'
'nineplus' anagrammed gives 'peninsul'.
'peninsul'+'a'='PENINSULA'
Can you help me to learn more?
(Other definitions for peninsula that I've seen before include "Long narrow piece of land projecting into the sea" , "coastal feature" , "cape" , "Land mostly surrounded by water" , "Jutting-out strip of land" .)