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12d (5) sudden tremor undermines northbound motorway

Spasm ? Can't parse

Also 20d (5) check over government rule

Reign again parse!

36av (6) posh look
Proclaimed in African country

Have Uganda but can't parse

SAPS is undermines (in the sense of what "Sappers" originally did)

U (posh) GANDER (look)

Reign?

25. Rein = Check, G = Government, Reign = Rule.

36 U = posh (Often used in crosswords) and Ganda sounds like Gander, look.