Dreadful goblin eats one hot (7)
I believe the answer is:
boiling
'hot' is the definition.
(similar in meaning)
'dreadful goblin eats one' is the wordplay.
'dreadful' indicates anagramming the letters.
'eats' indicates putting letters inside.
'one' becomes 'I' (Roman numeral).
'goblin' is an anagram of 'boilng'.
'boilng' going around 'i' is 'BOILING'.
(Other definitions for boiling that I've seen before include "Seething" , "Extremely hot" .)