Scheming lookalike finally fled London borough (6-7)

I believe the answer is:

double-dealing

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'scheming' is the definition.
Both the answer and definition are adjectives. Perhaps they are linked in a way I don't understand?

'lookalike finally fled london borough' is the wordplay.
'lookalike' becomes 'double' (I've seen this before).
'finally' says to take the final letters.
'london borough' becomes 'ealing' (I've seen this in other clues).
The last letter of 'fled' is 'd'.
'double'+'d'+'ealing'='DOUBLE-DEALING'

Can you help me to learn more?

(Other definitions for double-dealing that I've seen before include "Duplicity" , "Deceitful" .)

I've seen this clue in The Times.

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