7 down
Love
letter’s
opening
written
in
bold
(7)
Love letter’s opening written in bold (7)
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The definition is at the beginning of the clue.
How the clue works
The definition is Love — as in a term of endearment. Take the opening letter of "letter" (that's L) and write it inside daring (meaning bold), and you get DAR-L-ING.