Crossword Genius

Speed of light has mass in the void (5)

Ross

I believe the answer is:

chasm

'the void' is the definition.
(both can mean a large gulf or gap)

'speed of light has mass' is the wordplay.
'speed of light' becomes 'c' (as in E=mc2).
'mass' becomes 'm' (symbol used in Physics e.g. f=ma).
'c'+'has'+'m'='CHASM'

'in' acts as a link.

(Other definitions for chasm that I've seen before include "One gapes" , "Yawning gap" , "Gaping hollow" , "What's split" , "Deep opening in the earth's surface" .)

I've seen this clue in the Sydney Morning Herald.
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