Capable of working on till (2,2)
I believe the answer is:
up to
This clue might be a double definition.
'capable of' is the first definition.
(I've seen this before)
'working on till' is the second definition.
'up to' can be an answer for 'till' (thesaurus). I'm not sure about the 'working on' bit.
Can you help me to learn more?
(Other definitions for up to that I've seen before include "Plotting" , "Engaged in doing" , "As many as, though no more" , "As far as a certain point" , "Capable of" .)