In slips, lone catchers initially miss out (9)

I believe the answer is:

solecisms

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'in slips' is the definition.
'solecisms' can be an answer for 'slips' ('solecism' can be a synonym of 'slip'). I'm not certain of the 'in' bit.

'lone catchers initially miss out' is the wordplay.
'lone' becomes 'sole' (synonyms).
'initially' says to take the initial letters.
'out' is an anagram indicator (out can mean wrong or inaccurate).
The initial letter of 'catchers' is 'c'.
'miss' anagrammed gives 'isms'.
'sole'+'c'+'isms'='SOLECISMS'

Can you help me to learn more?

(Another definition for solecisms that I've seen is " Grammatical errors".)

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

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