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Well above my pay grade . 225 has for 12a Weapon made by Siemens, thought marines
S (siemens) + IDEA ("thought") + RM (Royal "Marines")

Is it a convention that you can clue a letter by taking the first letter of a brand ? E.g P for Pepsi , U for Unilever, H for Heinz etc? If so that seems to have passed me by over the years.

In this instance Siemens is the SI unit of electrical conductance (symbol S)

Thanks . I think the blogger should have explained that as I didn't know that