Got upset about a new ballroom dance (5)

I believe the answer is:

tango

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

'ballroom dance' is the definition.
(tango is a kind of ballroom dance)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for tango that I've seen before include "Modern ballroom dance" , "One from Argentina" , "Dance; T (radio comms.)" , "Activity requiring two to" , "Ballroom dance (for two?)" .)

I've seen this clue in The Telegraph.

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