Chap with a long time to run (6)
I believe the answer is:
manage
'run' is the definition.
(thesaurus)
'chap with a long time' is the wordplay.
'chap' becomes 'man' (I've seen this before**).
'with' says to put letters next to each other.
'a long time' becomes 'age' ('age' can be a synonym of 'long time').
'man'+'age'='MANAGE'
'to' acts as a link.
(Other definitions for manage that I've seen before include "Run; cope" , "Run, administer" , "Handle, oversee" , "Take control" , "Handle, cope with" .)