21 across
Good
argument
for
double,
for
example
(4)
Good argument for double, for example (4)
hints
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The definition is at the end of the clue.
How the clue works
The definition is double, for example, since doubling is one way of growing. You get there by sticking G (short for "good") in front of ROW (an argument), giving you G-ROW.