Figure Penny has fake army ID (7)
I believe the answer is:
pyramid
'figure' is the definition.
(thesaurus)
'penny has fake army id' is the wordplay.
'penny' becomes 'p' (short for pence).
'has' is a charade indicator (letters next to each other).
'fake' indicates an anagram (I've seen this in other clues).
'army' with letters rearranged gives 'yram'.
'p'+'yram'+'id'='PYRAMID'
(Other definitions for pyramid that I've seen before include "hierarchical organisation" , "Solid figure with triangular sides" , "A 3D shape" , "Egyptian landmark" , "old monument" .)