Crossword Genius

Things that burst out of star's trousers after length breaks fly (5,6)

Ross

I believe the answer is:

solar flares

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

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

'burst out of star's trousers after length breaks fly' is the wordplay.
I cannot quite see how this works, but
'of' could be 'o' and 'o' is found in the answer.
'trousers' could be 'flares' (I have seen 'Unfashionable trousers' mean 'flares' so perhaps 'trousers' could also mean 'flares') and 'flares' is found in the answer.
'length' could be 'r' (r is a kind of length) and 'r' is found within the answer.
This explanation may well be incorrect...

'that' is the link.

Can you help me to learn more?

I've seen this clue in The Independent.
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