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Fancy
suit
will
send
sweet
messages
of
endearment
(4,6)
Fancy suit will send sweet messages of endearment (4,6)
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The definition is at the end of the clue.
How the clue works
Right, so sweet messages of endearment at the end is what we're after — those little Love Hearts sweets with the soppy slogans printed on them. Split it up: "fancy" gives you LOVE, as in to fancy someone, and "suit" gives you HEARTS, one of the four card suits. Stick LOVE and HEARTS together and you're there.