I go on the run if I've gut wobbles (8)
I believe the answer is:
fugitive
'i go on the run' is the definition.
(a fugitive is on the run)
'if i've gut wobbles' is the wordplay.
'wobbles' is an anagram indicator (I've seen 'wobbling' mean this).
'if'+'ive'+'gut'='ifivegut'
'ifivegut' anagrammed gives 'FUGITIVE'.
(Other definitions for fugitive that I've seen before include "One fleeing captivity" , "Runaway from justice" , "One is fleeing from the law" , "Someone fleeing from justice" , "He's on the run, maybe from justice" .)