Particular demand (5)
I believe the answer is:
exact
I believe this is a double definition.
'particular' is the first definition.
(I've seen this before)
'demand' is the second definition.
(I know that demand can be written as exact)
(Other definitions for exact that I've seen before include "totally accurate" , "Completely accurate" , "Spot on, precise" , "Absolutely accurate or correct" , "Finished" .)