Crossword Genius

Spitting Image, say, boring local, possibly not unexpectedly (6,8)

Ross

I believe the answer is:

double negative

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'not unexpectedly' is the definition.
I can't tell whether this defines the answer.

'spitting image say boring local' is the wordplay.
'spitting image' becomes 'double' (both can mean a lookalike).
'say' becomes 'eg' (both can mean for example).
'boring' means one lot of letters goes inside another (some letters must 'bore' a hole into other letters).
'local' becomes 'native' (relating to a particular area).
'eg' going within 'native' is 'negative'.
'double'+'negative'='DOUBLE NEGATIVE'

'possibly' is the link.

Can you help me to learn more?

(Other definitions for double negative that I've seen before include "grammatical mistake" , "Grammatical error" , "No, never" .)

I've seen this clue in The Times.
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