The most common and most likely answer to this crossword clue is the 7 letter word WARPING
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Buddy explains!
The straight part
We know that "Rotational movement/travelling faster than the speed of light" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case rotational movement/travelling faster than the speed of light = warping.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does WARPING mean?
WARPING verb- To twist or become twisted, physically or mentally:
- (ropemaking) To run (yarn) off the reel into hauls to be tarred.
- To arrange (strands of thread, etc) so that they run lengthwise in weaving.
- To plot; to fabricate or weave (a plot or scheme).
- To change or fix (make fixed, for example by freezing).
- To move:
- (obsolete outside dialectal, of an animal) To bring forth (young) prematurely.
- To fertilize (low-lying land) by letting the tide, a river, or other water in upon it to deposit silt and alluvial matter.
- (very rare) To throw.
- An action or motion that warps or twists.
- The deformation of the Earth's crust over a large area
- The art or occupation of preparing warp or webs for the weaver.
- The practice of flooding agricultural land with turbid river water to add sediment to the soil.