Crossword Genius

A melon requires heat and moisture (6)

Ross

I believe the answer is:

sundew

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

'a melon' is the definition.
The definition and answer can be both plants as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'heat and moisture' is the wordplay.
'heat' becomes 'sun' (I can't justify this - if you can you should give a lot more credence to this answer).
'and' means one lot of letters go next to another.
'moisture' becomes 'dew' (I've seen this in another clue).
'sun'+'dew'='SUNDEW'

'requires' acts as a link.

Can you help me to learn more?

(Other definitions for sundew that I've seen before include "Insectivorous plant" , "Insects" , "Insect-eating bog plant" , "Carnivorous plant" .)

I've seen this clue in the Evening Standard.
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