Papers required in order of gems, if only a few (6)

I believe the answer is:
smidge
'only a few' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.
'papers required in order of gems' is the wordplay.
'papers' becomes 'ID' (short for identification papers).
'required in' is an insertion indicator.
'order of' is an anagram indicator.
'gems' with letters rearranged gives 'smge'.
'id' put inside 'smge' is 'SMIDGE'.
'if' acts as a link.
Can you help me to learn more?
(Other definitions for smidge that I've seen before include "very small part" , "Really tiny amount" .)
