Charge extra for the sculptured mount (8)

I believe the answer is:

rushmore

I'm a little stuck... Click here to teach me more about this clue!

'sculptured mount' is the definition.
'rushmore' can be an answer for 'mount' (Mount Rushmore in the USA). I'm unsure of the 'sculptured' bit.

'charge extra' is the wordplay.
'charge' becomes 'rush' (I've seen this before).
'extra' becomes 'more' (both can mean additional).
'rush'+'more'='RUSHMORE'

'for the' is the link.

Can you help me to learn more?

(Other definitions for rushmore that I've seen before include "Mount . . . . . . . . in USA has giant carvings of presidents" , "Mount . . . . . . . . in USA has carved heads of presidents" , "Mount with presidential statuary" , "US mountain with carved heads of presidents" , "Carved South Dakota Mount" .)

I've seen this clue in the Evening Standard.

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