Dry out! Heated? Dry out! (9)
I believe the answer is:
dehydrate
'dry out' is the definition.
(dehydrating is a kind of drying out)
'heated? dry out' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'heated'+'dry'='heateddry'
'heateddry' anagrammed gives 'DEHYDRATE'.
(Other definitions for dehydrate that I've seen before include "Remove moisture from, make dry" , "Remove water from" , "Remove moisture content from, dry out" , "Drain" , "Lose a lot of water" .)