National park freebie (3)
I believe the answer is:
map
'national park freebie' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for map that I've seen before include "Geographical plan" , "(Make a) geographical representation" , "Diagram of an area" , "face" , "Diagram of part of the earth's surface" .)