Cheat chauffeur that goes round and round delivering Premium Bonds? (11)

I believe the answer is:
screwdriver
'cheat chauffeur that goes round and round delivering premium bonds?' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.
'cheat chauffeur' is the wordplay.
'cheat' becomes 'screw' (synonyms).
'chauffeur' becomes 'driver' (I've seen this in another clue).
'screw'+'driver'='SCREWDRIVER'
Can you help me to learn more?
(Other definitions for screwdriver that I've seen before include "Hand tool - cocktail" , "may make a fixer tight?" , "Common tool" , "it gives the fixer a turn" , "Tool for turning fastening device" .)
