The short grains seen, again and again (6)
I believe the answer is:
thrice
'again and again' is the definition.
Both the definition and answer are adverbs. Perhaps they are linked in a way I don't understand?
'the short grains' is the wordplay.
'short' means to remove the last letter.
'grains' becomes 'rice' (I've seen this before).
'the' with its final letter removed is 'th'.
'th'+'rice'='THRICE'
'seen' is the link.
Can you help me to learn more?
(Other definitions for thrice that I've seen before include "Several times" , "as it can be found in little titbits" , "Archaic word for three times" , "On three occasions" , "Once, once more and yet once more" .)