Seam rolled back to cover silver screw (5)
I believe the answer is:
wages
'screw' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'seam rolled back to cover silver' is the wordplay.
'seam' becomes 'sew' (I've seen this in another clue).
'rolled back' says the letters should be written backwards.
'to cover' indicates putting letters inside.
'silver' becomes 'Ag' (Ag is the chemical symbol for silver).
'sew' in reverse letter order is 'wes'.
'wes' going around 'ag' is 'WAGES'.
Can you help me to learn more?
(Other definitions for wages that I've seen before include "Money for work" , "Reward" , "Weekly pay" , "Payments to employee for work" , "Work pay" .)