Contend this would produce a drink when legless (6)
I believe the answer is:
allege
'contend' is the definition.
(I've seen this in another clue)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for allege that I've seen before include "Claim, suggest" , "Cite in discussion" , "Accuse without established proof" , "Aver - maintain" , "Declare or accuse without proof" .)