Something to sit on, right up to now (5)
'up to now' is the definition.
(I've seen this before)
'something to sit on right' is the wordplay.
'something to sit on' becomes 'sofa' (I can't explain this - if you can you should give a lot more credence to this answer).
'right' becomes 'r' (common abbreviation).
'sofa'+'r'='SOFAR'
Can you help me to learn more?
(Other definitions for sofar that I've seen before include "'Heretofore (2,3)'" , "To this point" , "'Up to this time (2,3)'" , "Up till now" , "Up until the present moment" .)
'up to now' is the definition.
(I've seen this before)
'something to sit on right' is the wordplay.
I cannot quite see how this works, but
'right' could be 'far' (similar in meaning) and 'far' is found in the answer.
The remaining letters 'so' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for so far that I've seen before include "till now" , "Up until the present moment" , "to a certain degree" , "To this point" .)