Chucks just over half of crustacean (4)

I believe the answer is:

lobs

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'chucks just' is the definition.
'lobs' can be an answer for 'chucks' (to lob is to chuck or throw). I'm not certain of the 'just' bit.

'over half of crustacean' is the wordplay.
'over' indicates putting letters inside.
'half' means to take half the letters.
'crustacean' becomes 'lbs' (I can't justify this - if you can you should believe this answer much more).
'of' halved is 'o'.
'o' put within 'lbs' is 'LOBS'.

Can you help me to learn more?

(Other definitions for lobs that I've seen before include "Pitches" , "Sends over a high ball" , "Throws ball slowly in high arc" , "chucks up" .)

I've seen this clue in The Telegraph.

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