Below are possible answers for the crossword clue W.W. I Allied plane.
4 letter answer(s) to w.w. i allied plane
SPAD
A nail one or two inches long, of iron, brass, tin, or tinner iron, with a hole through the flattened head, used to mark stations in underground surveying.
A temporary civil servant working for a minister in the UK is known as a "SpAd" or more frequently "spad", a compound abbreviation formed from the initial letters of their official designation as a "special adviser".
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