Does being cleared for a visual approach supersede speed instructions from ATC? (FAA)
The AIM 4-4-12 says that an approach clearance cancels a speed restriction, but ATC can explicitly restate the restriction if needed:


  Approach clearances supersede any prior speed adjustment assignments,
  and pilots are expected to make their own speed adjustments as
  necessary to complete the approach. However, under certain
  circumstances, it may be necessary for ATC to issue further speed
  adjustments after approach clearance is issued to maintain separation
  between successive arrivals. Under such circumstances, previously
  issued speed adjustments will be restated if that speed is to be
  maintained or additional speed adjustments are requested. Speed
  adjustments should not be assigned inside the final approach fix on
  final or a point 5 miles from the runway, whichever is closer to the
  runway


The ATC orders 5-7-1 give the controller guidance:


  c. At the time approach clearance is issued, previously issued speed
  adjustments must be restated if required.  
  
  d. Approach clearances cancel any previously assigned speed
  adjustment. Pilots are expected to make their own speed adjustments to
  complete the approach unless the adjustments are restated