Bother found in a good half of ground (5)
I believe the answer is:
aggro
'bother' is the definition.
(short for aggression)
'a good half of ground' is the wordplay.
'good' becomes 'g' (abbreviation).
'half of' indicates taking half.
'ground' with half the letters taken is 'gro'.
'a'+'g'+'gro'='AGGRO'
'found in' is the link.
(Other definitions for aggro that I've seen before include "belligerence" , "In slang, hassle or troublemaking" , "Antisocial behaviour" , "Greek consumed by past" , "Problems and difficulties" .)