I suggest you spend under £20 get yourself a clio Haynes manual for the year your car was manufactured. There is a full instruction on how to remove the bumper and engine under tray and also how to get the horn. In any case , on some clios the under tray are riveted to the bumper and some are attached by plastic clips. On mine it was riveted I had to drill it out and replace it with plastic clips.
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Currently in alnapone's garage:
Grand Espace auto Dynamic S 2.0dci, Clio 1.5 dci dynamic