Some in Geneva demanding duck (5)
I believe the answer is:
evade
'duck' is the definition.
(synonyms)
'some in geneva demanding' is the wordplay.
'some in' says the answer is hidden in the clue.
'EVADE' is hidden in the letters of 'geneva demanding'.
(Other definitions for evade that I've seen before include "Circumvent, dodge" , "Escape (esp. by guile)" , "temptress conveying commercial message" , "Dodge by cleverness or trickery" , "Keep away from" .)