Valuable sausage-making ingredient (3)
I believe the answer is:
gem
'valuable' is the definition.
(gem is a kind of valuable)
'sausage-making ingredient' is the wordplay.
'ingredient' indicates the answer is hidden within the clue (I've seen 'ingredient of' mean this).
'GEM' can be found hidden inside 'sausage making'.
(Other definitions for gem that I've seen before include "perfect specimen" , "Pleasant and cheerful (from German)" , "36 Across or any other jewel" , "Kindness; comfort (German)" , "Valuable stone" .)