G-man returned, rode madly around street, thawed out (9)
I believe the answer is:
defrosted
'thawed out' is the definition.
(I've seen this in another clue)
'g-man returned rode madly around street' is the wordplay.
'g-man' becomes 'fed' (I've seen this in another clue).
'returned' says the letters should be written in reverse.
'madly' indicates an anagram.
'around' means one lot of letters goes inside another.
'street' becomes 'st' (abbreviation).
'fed' back-to-front is 'def'.
'rode' with letters rearranged gives 'roed'.
'roed' placed around 'st' is 'rosted'.
'def'+'rosted'='DEFROSTED'
(Other definitions for defrosted that I've seen before include "melted" , "warmed up" .)