Some lust in Yorkshire insignificant (4)
I believe the answer is:
tiny
'insignificant' is the definition.
(I've seen this before)
'some lust in yorkshire' is the wordplay.
'some' indicates the answer is hidden within the clue (some parts of the word are used).
'TINY' can be found hidden inside 'lust in yorkshire'.
(Other definitions for tiny that I've seen before include "Really small" , "Underdeveloped" , "Minute, diminutive" , "Quite insignificant" , "pocket" .)