Crossword Genius

Self-righteous hints from gunsmiths (4)

Ross

I believe the answer is:

smug

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

'self-righteous' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for smug that I've seen before include "Full of oneself" , "Showing excessive self-pride" , "Spruce" , "Unpleasantly complacent" , "Self-satisfied, stuffy" .)

I've seen this clue in the Irish Times (Crosaire) and the Irish Times.
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