Reveal sources of new material in University Challenge (6)
I believe the answer is:
unmask
'reveal' is the definition.
(I've seen this before)
'sources of new material in university challenge' is the wordplay.
'sources of' indicates taking the first letters (the beginning of a word is its sauce).
'in' indicates putting letters inside.
'university' becomes 'u' (abbreviation for university).
'challenge' becomes 'ask' (I can't explain this - if you can you should believe this answer much more).
The initial letters of 'new material' is 'nm'.
'u'+'ask'='uask'
'nm' put into 'uask' is 'UNMASK'.
Can you help me to learn more?
(Other definitions for unmask that I've seen before include "Discover the identity of" , "Expose, remove disguise" , "Reveal true identity of" , "Identify (someone hidden)" , "Expose, remove face covering" .)