A bit astray at ,previous performance (7)

I believe the answer is:

inexact

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

'a bit astray' is the definition.
I can't judge whether this defines the answer.

'at previous performance' is the wordplay.
'at' becomes 'in' (synonymous in some cases - eg at school, in school).
'previous' becomes 'ex' (prefix meaning former or onetime).
'performance' becomes 'act' (act is a kind of performance).
'in'+'ex'+'act'='INEXACT'

Can you help me to learn more?

(Other definitions for inexact that I've seen before include "Not quite right" , "Woolly" , "Nice tax (nag.)" , "Not quite accurate" , "loose" .)

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

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.