Crossword Genius

Weapon that makes Jack a junior NCO (5)

Ross

I believe the answer is:

lance

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

'weapon' is the definition.
(lance is a kind of weapon)

'jack a junior nco' is the wordplay.
I cannot quite see how this works, but
'a' could be 'an' and 'an' is located in the answer.
This explanation may well be incorrect...

'that makes' acts as a link.

Can you help me to learn more?

(Other definitions for lance that I've seen before include "Incise" , "Old cavalry weapon" , "Weapon of knights of old" , "Boy - prick (a boil)" , "Long weapon; prick" .)

I've seen this clue in the Evening Standard.
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