Draw musket - charged, loaded (6)

I believe the answer is:

sketch

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

'draw' is the definition.
(I know that sketch is a more specific form of the action draw)

'musket charged loaded' is the wordplay.
'SKETCH' is hidden in amongst the letters.
But, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for sketch that I've seen before include "Slow of understanding" , "Short account" , "Unfinished drawing" , "Delineate" , "Portrait" .)

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

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