Doing less than (2,2)
I believe the answer is:
up to
I believe this clue is a double definition.
'doing' is the first definition.
(as in 'what are you up to?')
'less than' is the second definition.
(eg up to 10 means less than 10)
(Other definitions for up to that I've seen before include "As far as or as many as" , "Engaged in doing" , "Capable of" , "Incumbent upon" , "Busy with" .)