Study, for some students, is a revealing thing to do (6)
I believe the answer is:
denude
'do' is the definition.
Although both the answer and definition are verbs in their base form, I can't understand how one could define the other.
'study for some students is a revealing thing' is the wordplay.
'study' becomes 'den' (term for a study or office).
'for' means one lot of letters go next to another.
'some' indicates the central letters.
'students' becomes 'NUS' (National Union of Students).
'is a revealing thing' becomes 'de' (I am not sure about this - if you are sure you should believe this answer much more).
The centre of 'nus' is 'u'.
'den'+'u'+'de'='DENUDE'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for denude that I've seen before include "Strip cover from, as leaves from trees" , "Dundee (anag.)" , "Lay bare" , "Clear so that nothing is left" , "Strip - expose" .)