Twofold (4)
'twofold' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for dual that I've seen before include "Road with central division" , "Consisting of pairs" , "Double" , "Twofold" , "Consisting of two parts" .)
'twofold' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for twin that I've seen before include "One of two duplicates" , "One of two born together" , "This set is matching jumper and cardigan" , "One born with another" , "One from double birth" .)
'twofold' is the definition.
(I know that twofold can be written as double)
This is the entire clue.
(Other definitions for double that I've seen before include "Twice - bent over - run" , "Make twice as many" , "Multiply by two" , "Twice, the size say" , "Orwellian acceptance of conflicting principles" .)
(Other definitions for twice that I've seen before include "Two times" , "You only live -- (film)" , "Double in quantity" , "Doubly" .)
'twofold' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for duple that I've seen before include "two ways?" , "(Of rhythm) based on two beats in the bar" , "Double, twofold" .)