Metrical foot consisting of an unstressed and a stressed syllable (4)

I believe the answer is:

iamb

(Other definitions for iamb that I've seen before include "Poet's foot" , "Metrical foot of one short, one long syllables" , "Line of verse" , "Short-long metrical foot" , "Part of a pentameter?" .)

I've seen this clue in The Guardian.

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