Very hot without right current (7)
I believe the answer is:
'current' is the definition.
(similar in meaning)
'very hot without right' is the wordplay.
'very hot' becomes 'tropical' (in the tropics).
'without' is a deletion indicator.
'right' becomes 'r' (common abbreviation).
'tropical' with 'r' removed is 'TOPICAL'.
(Other definitions for topical that I've seen before include "Related to current affairs" , "Some skin lotions are" , "Relating to current affairs" , "Dealing with current affairs" , "About current events, of present interest" .)