local works if you use glob assignment syntax: 

{ 
    local *Time::HiRes::gettimeofday = sub { print 42; }; 
    print Time::HiRes::gettimeofday(); 
};;
Subroutine Time::HiRes::gettimeofday redefined at (eval 4) line 1, <ST
+DIN> line 2.
42
1
print Time::HiRes::gettimeofday();;
1172754765 437500

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In reply to Re^3: restore overridden XS methods by BrowserUk
in thread restore overridden XS methods by dk

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