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Point discolorations out on the map of Surrey (7)

Ross

I believe the answer is:

staines

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'the map of surrey' is the definition.
I can't tell whether this defines the answer.

'point discolorations out' is the wordplay.
'point' becomes 'E' (compass point).
'discolorations' becomes 'stains' ('stain' can be a synonym of 'discoloration').
'out' indicates putting letters inside.
'e' going into 'stains' is 'STAINES'.

'on' acts as a link.

Can you help me to learn more?

(Other definitions for staines that I've seen before include "Town SW of Heathrow" , "Surrey town on Thames" .)

I've seen this clue in the Evening Standard.
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