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There are clamp meters, but I'm pretty sure they only work on AC current.
Faced with this situation, I've usually resorted to driving a fine sewing needle through the insulation into the core, and taking a measurement from there. The pinhole that remains shouldn't compromise the insulation enough for you to need to apply tape, but if you want to play it absolutely safe, then by all means do.
Yours is the L2 hatch isn't it? Your best bet really is the multiplug behind the left hand boot trim. Once you've got to it, you can find the wire with a conventional multimeter. Getting at it is only really a hassle if you have the boot mounted CD changer. Otherwise, it should only take you a few minutes with the correct tools. Don't bodge this job by hacking into the loom when you can easily get at the individual wires
Currently in Horatio's garage:
2010 Laguna III Initiale.