Grain tower (4)

I think it could be either:

silo

barn

'grain tower' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for silo that I've seen before include "Grain storage tower" , "Grain storage area" , "Storage space for fodder" , "Tower for making fodder" , "Farm tower" .)

I've seen this clue in The Mirror, The Guardian, the LA Times, the Newsday, The Telegraph, the Penny Press, the USA Today, the Universal and The Star Tribune.

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