Upright character smooth enrolling student for Easter? (6)
I believe the answer is:
island
'easter?' is the definition.
(Easter Island is an example)
'upright character smooth enrolling student' is the wordplay.
'upright character' becomes 'I' (vertical letter of the alphabet).
'smooth' becomes 'sand' (sanding is a kind of smoothing).
'enrolling' means one lot of letters goes inside another (inserted letters are enrolled or included).
'student' becomes 'l' (as in L-plates for learner drivers).
'sand' enclosing 'l' is 'sland'.
'i'+'sland'='ISLAND'
'for' is the link.
(Other definitions for island that I've seen before include "Lewis and Harris, possibly" , "area adjacent to water" , "Barbados, say" , "Tract surrounded by water" , "Water-girt territory" .)