Cream used up to (and rubbed into) injured loin (6)
I believe the answer is:
lotion
'cream' is the definition.
(I've seen this before)
'rubbed into injured loin' is the wordplay.
'rubbed' becomes 'ot' (I can't justify this - if you can you should give a lot more credence to this answer).
'into' is an insertion indicator.
'injured' is an anagram indicator.
'loin' is an anagram of 'lion'.
'ot' going within 'lion' is 'LOTION'.
'used up to and' is the link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for lotion that I've seen before include "Unguent" , "Medicinal or cosmetic liquid for skin" , "Liquid equivalent to ointment" , "cosmetic cream" , "Soothing liquid preparation" .)