Newspaper editor originally employed in cricket side frequently (5)
I believe the answer is:
often
'frequently' is the definition.
('often' can be a synonym of 'frequently')
'newspaper editor originally employed in cricket side' is the wordplay.
'newspaper' becomes 'ft'.
'originally' suggests taking the first letters.
'employed in' indicates putting letters inside.
'cricket side' becomes 'on'.
The first letter of 'editor' is 'e'.
'ft'+'e'='fte'
'fte' placed within 'on' is 'OFTEN'.
(Other definitions for often that I've seen before include "Multiply" , "Frequently, not seldom" , "on many occasions" , "Turn away" , "Regularly" .)