Third person singular present tense of 'clag'; sticks, adheres, or becomes clogged.
From 'clag' (to stick) + '-s' (third person singular ending). Standard verb conjugation in British English.
English verbs are predictable—if one thing 'clags,' multiple things 'clag,' and he/she/it 'clags'—unless it's one of English's thousands of irregular exceptions.
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