Brownish-yellow brooch repaired in part (5)
I believe the answer is:
ochre
'brownish-yellow' is the definition.
(I've seen this in another clue)
'brooch repaired in part' is the wordplay.
'in part' indicates the answer is hidden within the clue.
'OCHRE' is hidden within 'brooch repaired'.
(Other definitions for ochre that I've seen before include "A shade" , "Yellow-orange colour" , "Earthy colour" , "Yellow/brown/red pigment" , "yellowy-orange" .)