Standard extract from Goodman or Miller (4)
I believe the answer is:
norm
'standard' is the definition.
(I know that norm is a type of standard)
'extract from goodman or miller' is the wordplay.
'extract from' indicates a hidden word (some letters extracted from the clue).
'NORM' is hidden in the letters of 'goodman or miller'.
(Other definitions for norm that I've seen before include "What is conventional, regular" , "Standard choice" , "Typical, usual" , "Small boy" , "Required or acceptable standard" .)