Elastic we gather, medium floury foodstuff (9)
I believe the answer is:
wheatgerm
'floury foodstuff' is the definition.
'wheatgerm' can be an answer for 'foodstuff' (I've seen this before). I am unsure of the 'floury' bit.
'elastic we gather medium' is the wordplay.
'elastic' is an anagram indicator (the anagram stretches or twists into a new form).
'medium' becomes 'm' (as in UK clothing sizes).
'we'+'gather'='wegather'
'wegather' anagrammed gives 'wheatger'.
'wheatger'+'m'='WHEATGERM'
Can you help me to learn more?
(Other definitions for wheatgerm that I've seen before include "Dry floury foodstuff - merge what? (anag)" , "Nutritious cereal foodstuff" .)