Very stupid to accommodate university element (6)
I believe the answer is:
sodium
'element' is the definition.
(I know that sodium is a type of metal)
'very stupid to accommodate university' is the wordplay.
'very' becomes 'so' (both can mean 'extremely').
'stupid' becomes 'dim' (similar in meaning).
'to accommodate' indicates putting letters inside.
'university' becomes 'u' (abbreviation for university).
'dim' placed around 'u' is 'dium'.
'so'+'dium'='SODIUM'
(Other definitions for sodium that I've seen before include "Alkali-metal element, Na" , "Element in table salt" , "Atomic number 11" , "Chemical element (Na)" , "Metal found in salt water, Na" .)