And written wrongly in eras of business programs (7)
I believe the answer is:
agendas
'business programs' is the definition.
'agendas' can be an answer for 'programs' (agenda is a kind of program). I am not certain of the 'business' bit.
'and written wrongly in eras' is the wordplay.
'and' becomes 'n' (common abbreviation for 'and').
'written wrongly' becomes 'da' (I can't explain this - if you can you should give a lot more credence to this answer).
'in' indicates putting letters inside.
'eras' becomes 'ages' (I've seen this in another clue).
'n'+'da'='nda'
'nda' put inside 'ages' is 'AGENDAS'.
'of' is the link.
Can you help me to learn more?
(Other definitions for agendas that I've seen before include "Orders of business" , "Committee-matters" , "programmes" , "Lists of matters to be taken up at meetings" , "Schedules" .)