Manages to understand both Sun and Times (4,2)
I believe the answer is:
gets by
'manages' is the definition.
('get by' can be a synonym of 'manage')
'understand both sun and times' is the wordplay.
'understand' becomes 'get' (getting is a kind of understanding).
'both sun' becomes 's' (abbreviation. I am not sure about the 'both' bit.).
'and' means one lot of letters go next to another.
'times' becomes 'by' (both can mean 'multiplied by').
'get'+'s'+'by'='GETS BY'
'to' acts as a link.
(Other definitions for gets by that I've seen before include "Manages" , "makes do" , "Planet Herschel found" , "copes" .)