Offer Richard bags of iron (6)
I believe the answer is:
ferric
'of iron' is the definition.
(I've seen this before)
'offer richard bags' is the wordplay.
'bags' indicates a hidden word.
'FERRIC' is hidden in the letters of 'offer richard'.
(Other definitions for ferric that I've seen before include "Containing iron" , "made of iron" , "Relating to one form of iron" , "Of trivalent iron" , "Of iron with a valency of three" .)