Weapon pointed upward, get a big lump (6)

I believe the answer is:

nugget

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'lump' is the definition.
(I know that nugget is a type of lump)

I don't understand the remainder of the clue.

(Other definitions for nugget that I've seen before include "Lump (of gold, etc)" , "Lump of gold ore" , "Raw lump (of gold)" , "Lump sought by the prospector" , "valuable bit of information" .)

I've seen this clue in the Sydney Morning Herald.

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