Rumble around possibly followed by Jack (6)
I believe the answer is:
lumber
'possibly followed by jack' is the definition.
I can't judge whether this definition defines the answer.
'rumble around' is the wordplay.
'around' indicates an anagram.
'rumble' anagrammed gives 'LUMBER'.
Can you help me to learn more?
(Other definitions for lumber that I've seen before include "Walk heavily carrying wood?" , "Sawn wood - be a burden to" , "Move clumsily - Jack's wood?" , "articles in storage" , "Wood for building - saddle" .)