Duck broken beer mugs (8)
I believe the answer is:
submerge
'duck' is the definition.
(I've seen this before)
'broken beer mugs' is the wordplay.
'broken' indicates anagramming the letters.
'beer'+'mugs'='beermugs'
'beermugs' anagrammed gives 'SUBMERGE'.
(Other definitions for submerge that I've seen before include "Cover" , "Put under water" , "Put under liquid's surface" , "swill round" , "(Submarine) dive" .)