Crossword Genius

Touchdown, in two words, makes you experience sadness (4,4)

Ross

I believe the answer is:

feel blue

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

'sadness' is the definition.
(I know that sadness can be written as feel blue)

'touchdown in two words makes you experience' is the wordplay.
I cannot really understand how this works, but
'you' could be 'u' (commonly used in online communication) and 'u' is located in the answer.
'experience' could be 'feel' (synonyms) and 'feel' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Guardian.
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