Figure hammered initially from silver with no back (7)

I believe the answer is:

hexagon

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'figure' is the definition.
(type of geometrical figure)

'hammered initially from silver with no back' is the wordplay.
'initially' indicates taking the first letters.
'from' becomes 'ex' ('from' in Latin).
'silver with no back' becomes 'agon' (I can't explain this - if you can you should believe this answer much more).
The initial letter of 'hammered' is 'h'.
'h'+'ex'+'agon'='HEXAGON'

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(Other definitions for hexagon that I've seen before include "Shape of a honeycomb cell" , "A six-sided geometric figure" , "Six-sided shape" , "there are several sides to it" , "Six-sided polygon" .)

I've seen this clue in the Sydney Morning Herald.

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