One included in censure is to lose value (10)
I believe the answer is:
depreciate
'to lose value' is the definition.
(I've seen this before)
'one included in censure' is the wordplay.
'one' becomes 'i' (Roman numeral).
'included in' means one lot of letters goes inside another.
'censure' becomes 'deprecate'.
'i' inserted within 'deprecate' is 'DEPRECIATE'.
'is' acts as a link.
(Other definitions for depreciate that I've seen before include "Gradually lose value" , "Belittle; lose value" , "Lose value with time" .)