Return information found in a small piece of bone (5)
I believe the answer is:
tibia
'bone' is the definition.
(I know that tibia is a type of long bone)
'return information found in a small piece' is the wordplay.
'return' says the letters should be written backwards.
'information' becomes 'i' (common abbreviation for information).
'found in' means one lot of letters goes inside another.
'small piece' becomes 'bit' (I've seen this before).
'a'+'bit'='abit'
'i' inserted into 'abit' is 'aibit'.
'aibit' back-to-front is 'TIBIA'.
'of' acts as a link.
(Other definitions for tibia that I've seen before include "Shin bone" , "The formal shinbone" , "Bone in osso bucco" , "Bone of the lower leg" , "Part of leg of" .)