Cobs running in also run off (7)
I believe the answer is:
abscond
'run off' is the definition.
(synonyms)
'cobs running in also' is the wordplay.
'running' indicates anagramming the letters (the letters run around to different places).
'in' means one lot of letters goes inside another.
'also' becomes 'and' (both can mean in addition).
'cobs' is an anagram of 'bsco'.
'bsco' placed inside 'and' is 'ABSCOND'.
(Other definitions for abscond that I've seen before include "Go away secretly after wrongdoing" , "desert" , "scarper" , "Run away from a legal process" , "Decamp; bolt" .)