German motto of the Prince of Wales meaning "I serve” (3,4)

I believe the answer is:

ich dien

(Other definitions for ich dien that I've seen before include "(German) motto on the heraldic badge of the Prince of Wales" , "Royal motto" , "Motto under the Prince of Wales's feathers (German)" , ""I serve"" .)

I've seen this clue in The Times.

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