26 down
Easy:
massive
return
with
little
initially
invested
(4)
Easy: massive return with little initially invested (4)
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The definition is at the beginning of the clue.
How the clue works
See Easy there — that's your definition, glib meaning easy or smooth-talking. Now for the build: "massive" gives you BIG, and "return" tells you to flip it round to GIB. Then "little initially" just means the first letter of "little", L, gets invested (stuck) inside that, giving you G, then L, then IB.