Seed cases finally just split open (5)

I believe the answer is:

burst

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'split open' is the definition.
'burst' can be an answer for 'split' ('burst' can be a synonym of 'split'). I am not sure about the 'open' bit.

'seed cases finally just' is the wordplay.
'seed cases' becomes 'burs' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'finally' indicates one should take the final letters.
The last letter of 'just' is 't'.
'burs'+'t'='BURST'

Can you help me to learn more?

(Other definitions for burst that I've seen before include "Explode; volley (of fire)" , "Be very full (with)" , "Suddenly break open" , "Rupture" , "Blowout" .)

I've seen this clue in The Telegraph.

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