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Polish picture that depicts decisive crossing (7)

Ross

I believe the answer is:

rubicon

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'polish picture that depicts decisive crossing' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'polish picture' is the wordplay.
'polish' becomes 'rub' (polish meaning rub to make shiny).
'picture' becomes 'icon' (synonyms).
'rub'+'icon'='RUBICON'

Can you help me to learn more?

(Other definitions for rubicon that I've seen before include "Stream in north Italy that Julius Caesar crossed in 49 BC" , "win at piquet" , "term used in 12 [PIQUET]" , "Caeser crossed this river in a decisive step- no going back" , "Line fatefully gone over" .)

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