A label with some postage stamps (3)
I believe the answer is:
tag
'a label' is the definition.
(I know that tag is a type of label)
'some postage stamps' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'TAG' can be found hidden inside 'postage stamps'.
'with' acts as a link.
(Other definitions for tag that I've seen before include "Label or sticker" , "Small label" , "Restriction" , "Earmark" , "Label - children's game" .)