Crossword Genius

Concerned about heat and dry? Frantically do this (9)

Ross

I believe the answer is:

rehydrate

I'm a little stuck... Click here to teach me more about this clue!

'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'.
're'+'hydrate'='REHYDRATE'

Can you help me to learn more?

(Another definition for rehydrate that I've seen is " Add water to (a dried substance)".)

I've seen this clue in The Independent.
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