Working with ordinary couple of females, intermittently (2-3-3)
I believe the answer is:
on-and-off
'intermittently' is the definition.
(I've seen this before)
'working with ordinary couple of females' is the wordplay.
'working' becomes 'on' (on can mean working or activated).
'with' becomes 'and'.
'ordinary' becomes 'O' (abbreviation e.g. O-Levels).
'couple of females' becomes 'ff' (two abbreviations for female).
'on'+'and'+'o'+'ff'='ON AND OFF'
(Other definitions for on-and-off that I've seen before include "not consistent?" , "Cricket sides" .)