Possibly hit the road with a decent part (5)
I believe the answer is:
third
'a decent part' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'possibly hit the road' is the wordplay.
'possibly' indicates anagramming the letters.
'the road' becomes 'rd' (abbreviation).
'hit' is an anagram of 'thi'.
'thi'+'rd'='THIRD'
'with' is the link.
Can you help me to learn more?
(Other definitions for third that I've seen before include "Ruthless interrogation" , "Last place on the podium?" , "Last of three" , "Bronze medal place" , "Musical interval" .)