IN-NUENDOS
Credit: NY Times Crossword - April 8, 2012
Daniel A. Finan

The answer to the first clue in each set is hidden in the second clue. For example,

Preventive measure, proverbially
IT'S TOLD USING A WATCH

The second clue can be answered with the word TIME. The proverbial preventive measure is a
STITCH in TIME - hidden as it'S Told usIng a waTCH.

1)
Headstone phrase
TREATY RESULT

2)
"to be on the safe side"
JUDGE'S MATTER

3)
Golf ace
THE LONELIEST NUMBER

4)
One who looks friendly, but isn't
WOOL, FACETIOUSLY

HINTS:
Second clue answers:
1. PEACE
2. CASE
3. ONE
4. SHEEP'S CLOTHING

Answers:

1. Rest in peace - tREaty reSulT
2. Just in case - JUdge'S maTter
3. Hole-in-one -  tHe lOneLiEst number
4. Wolf in sheep's clothing - WOoL, Facetiously