Parliamentary device requires luck in stopping deceit (10)
I believe the answer is:
guillotine
'parliamentary device' is the definition.
'guillotine' can be an answer for 'device' (guillotine is a kind of device). I am not certain of the 'parliamentary' bit.
'luck in stopping deceit' is the wordplay.
'luck' becomes 'lot' (synonyms).
'stopping' means one lot of letters goes inside another (stopping can mean blocking a gap).
'deceit' becomes 'guile' (guile is a kind of deceit).
'lot'+'in'='lotin'
'lotin' put into 'guile' is 'GUILLOTINE'.
'requires' is the link.
Can you help me to learn more?
(Other definitions for guillotine that I've seen before include "One with sharp blade" , "Paper trimmer" , "Revolutionary tool" , "limits debate" , "revolutionary chopper" .)