Crossword Genius

Waffle about central heating being dry (5)

Ross

I believe the answer is:

parch

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'being dry' is the definition.
(I've seen this in another clue)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for parch that I've seen before include "Dehydrate" , "Make hot and dry" , "Make dry through heat" , "Get overheated" , "Cause to wither" .)

I've seen this clue in The Sunday Times and The Times.
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