Compact body of troops (7)

I believe the answer is:

phalanx

(Other definitions for phalanx that I've seen before include "Body of troops in close formation" , "Closely ranked crowd of people" , "Compact mass of people banded together, or old Greek battle line" , "seeing hard man in GIs' shop" , "Compact infantry mass; finger bone" .)

I've seen this clue in The Sun.

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