Rough during performance about Exodus (7)
I believe the answer is:
inexact
'rough' is the definition.
(similar in meaning)
'during performance about exodus' is the wordplay.
'during' becomes 'in' (e.g. during February means in February).
'performance' becomes 'act' (act is a kind of performance).
'about' means one lot of letters go next to another.
'exodus' becomes 'ex' (I can't explain this - if you can you should believe this answer much more).
'act' put after 'ex' is 'exact'.
'in'+'exact'='INEXACT'
Can you help me to learn more?
(Other definitions for inexact that I've seen before include "Not precise, approximate" , "not precisely correct" , "Not precise, like some sciences" , "estimated?" , "Nice tax (nag.)" .)