Concerned about heat and dry? Frantically do this (9)
I believe the answer is:
Here is my best explanation:
'do this' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.
'concerned about heat and dry? frantically' is the wordplay.
'concerned about' becomes 're' (regarding).
'and' is a charade indicator (letters next to each other) (I've seen this in other clues).
'frantically' is an anagram indicator.
'heat' put after 'dry' is 'dryheat'.
'dryheat' is an anagram of 'hydrate'.