Wise guy moving nearly all scrap metal (5,4)
I believe the answer is:
smart alec
'wise guy' is the definition.
(I've seen this before)
'moving nearly all scrap metal' is the wordplay.
'moving' is an anagram indicator (letters are moved around).
'nearly all' means to remove the last letter (most but not all of the word).
'scrap' with its last letter taken off is 'scra'.
'scra'+'metal'='scrametal'
'scrametal' is an anagram of 'SMART-ALEC'.
(Other definitions for smart alec that I've seen before include "wise guy" , "Clever sort" , "Clever Dick" , "Know-all" , "Clever person" .)