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14a Lady sins - a home broken - what's caused adultery? (6,7)
23a Spit 'leek' out - it's a bit of grass (8)
5d In cursory comments old boy gets cattier somehow about princess (6,5)

23 Spikelet, blade of grass, anagram.

5 Obiter dicta, Latin phrase, for cursory comments. OB = Old boy, then 'cattier' and Di, princess, anagrammed.

Ashley Madison, a dating agency for married people/people in relationships. I think it's American. It's an anagram ('broken') of the first four words in the clue.

14 is an anagram - ashley madison - some kind of dating website