Serving no practical purpose (6)
'serving no practical purpose' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for otiose that I've seen before include "Slothful" , "Indolent or superfluous" , "Serving no useful purpose" , "Indolent, lazy" , "Devoid of worth or significance" .)
'serving no practical purpose' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for useless that I've seen before include "Worth zilch" , "Is Sue less impractical?" , "Having no benefical function" , "Vain, impractical" , "Not worth a jot" .)