Crossword Genius

A major rumpus over little opens a traumatic problem (1,5,2,1,6)

Ross

I believe the answer is:

a storm in a teacup

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

'a major rumpus over little' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'opens a traumatic problem' is the wordplay.
'problem' is an anagram indicator.
'opens'+'a'+'traumatic'='opensatraumatic'
'opensatraumatic' is an anagram of 'A STORM IN A TEACUP'.

Can you help me to learn more?

(Other definitions for a storm in a teacup that I've seen before include "Much Ado about Nothing" , "too much for a trifle" .)

I've seen this clue in the Sydney Morning Herald.
Want a hint initially instead of a full solution? Install my app