Steep slope recent maps disguised (10)
I believe the answer is:
escarpment
'steep slope' is the definition.
(I've seen this before)
'recent maps disguised' is the wordplay.
'disguised' indicates an anagram.
'recent'+'maps'='recentmaps'
'recentmaps' with letters rearranged gives 'ESCARPMENT'.
(Other definitions for escarpment that I've seen before include "Steep slope - map's centre (anag)" , "Face" , "cliff" , "Steep slope at edge of plateau" , "Bluff" .)