1 across
Endless
effect
of
gravity
–
time
to
leave
white
dwarf,
say,
for
something
denser
(6)
Endless effect of gravity – time to leave white dwarf, say, for something denser (6)
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The definition is at the end of the clue.
How the clue works
The definition is something denser — a pulsar is indeed a denser stellar object than a white dwarf. "Effect of gravity" gives you PULL, which becomes PUL once you make it "endless" by dropping the final letter; then "white dwarf, say" points to STAR ("say" tells you it's just one example of that type), and "time to leave" means you remove the T, leaving SAR. Put PUL and SAR together and there's your answer.