Miniatures fly to extremes of tantrums! (7)

I believe the answer is:

midgets

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'miniatures' is the definition.
Although both the answer and definition are plural nouns, I cannot understand how they can define each other.

'fly to extremes of tantrums' is the wordplay.
'fly' becomes 'midge' (I've seen this before).
'to extremes of' means to remove the middle letters.
'tantrums' with its middle removed is 'ts'.
'midge'+'ts'='MIDGETS'

Can you help me to learn more?

I've seen this clue in the Evening Standard.

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