Crossword Genius

Former spouse gets saucy — one should know better! (6)

Ross

I believe the answer is:

expert

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'one should know better' is the definition.
I can't tell whether this definition defines the answer.

'former spouse gets saucy' is the wordplay.
'former spouse' becomes 'ex' (an ex-spouse).
'gets' is a charade indicator (letters next to each other).
'saucy' becomes 'pert' (synonyms).
'ex'+'pert'='EXPERT'

Can you help me to learn more?

(Other definitions for expert that I've seen before include "One has specialist knowledge or ability" , "At the right moment" , "The person who knows" , "Person with great knowledge or skill, specialist" , "Adept" .)

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