Rain dance from animated cartoon - The Fruit of the Greenhouse (6)

I believe the answer is:

tomato

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

'fruit of the greenhouse' is the definition.
'tomato' can be an answer for 'fruit' (I've seen this before). I am not certain of the 'of the greenhouse' bit.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for tomato that I've seen before include "It's also known as a love apple" , "Pulpy fruit eaten as vegetable" , "Shiny red fruit" , "Part of a BLT sandwich" , "A motto, strangely, for this fruit" .)

I've seen this clue in the Irish Times.

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