Crossword Genius

I see rat in retreat, a Russian one? (5)

Ross

I believe the answer is:

dacha

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'a russian one?' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'i see rat in retreat' is the wordplay.
'i see' becomes 'ah' ('ah' can be used to express understanding).
'rat' becomes 'cad' (both can mean an unpleasant person).
'in retreat' shows that the letters should be reversed in order.
'ah'+'cad'='ahcad'
'ahcad' backwards is 'DACHA'.

Can you help me to learn more?

(Other definitions for dacha that I've seen before include "Country home in Russia" , "Russian second home" , "Russian villa" , "Russian retreat" , "Russian's second home in the country" .)

I've seen this clue in The Times.
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