Walk all over right back of large dimensions (7)

I believe the answer is:

trample

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'walk all over' is the definition.
(I've seen this before)

'right back of large dimensions' is the wordplay.
'right' becomes 'rt'.
'back of' is a reversal indicator (I've seen 'backed' mean this).
'large dimensions' becomes 'ample' (I am not sure about this - if you are sure you should believe this answer much more).
'rt' written backwards gives 'tr'.
'tr'+'ample'='TRAMPLE'

Can you help me to learn more?

(Other definitions for trample that I've seen before include "Crush with the feet" , "Insult" , "Tread heavily" , "Heedlessly tread down" , "Flatten" .)

I've seen this clue in The Guardian.

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