Continuous line on map's almost identical on rocky peak (7)
I believe the answer is:
equator
'continuous line on map's' is the definition.
I can't tell whether this defines the answer.
'almost identical on rocky peak' is the wordplay.
'almost' means to remove the last letter (most of the word but not all of it).
'identical' becomes 'equal' (I've seen this before).
'on rocky peak' becomes 'tor' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'equal' with its last letter removed is 'equa'.
'equa'+'tor'='EQUATOR'
Can you help me to learn more?
(Other definitions for equator that I've seen before include "Imaginary line around the earth's circumference" , "Earth's north-south dividing line" , "Circle round the globe" , "It's at zero degrees latitude" , "It's equidistant from North and South Poles" .)