He's not upset about runs to get trim (7)
I believe the answer is:
shorten
'trim' is the definition.
(shortening is a kind of trimming)
'he's not upset about runs' is the wordplay.
'upset' indicates an anagram.
'about' indicates putting letters inside.
'runs' becomes 'r' (cricket abbreviation**).
'hes'+'not'='hesnot'
'hesnot' is an anagram of 'shoten'.
'shoten' enclosing 'r' is 'SHORTEN'.
'to get' acts as a link.
(Other definitions for shorten that I've seen before include "Make less long" , "Curtail" , "Prune" , "Abbreviate" , "Clip" .)