27 across
Moderation
of
rent
increase
(3-2)
Moderation of rent increase (3-2)
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The definition is at the beginning of the clue.
How the clue works
The definition is Moderation, meaning a lessening or easing off. The wordplay is a charade: LET means "rent" (as in letting a property), and UP means "increase". Put them together and you get LET-UP, which means a moderation or reduction in intensity.