Raise cheer about beginnings of Enigmatic Variations (7)
I believe the answer is:
elevate
'raise' is the definition.
('elevate' can be a synonym of 'raise')
'cheer about beginnings of enigmatic variations' is the wordplay.
'cheer' becomes 'elate' (I've seen this before).
'about' means one lot of letters goes inside another.
'beginnings of' indicates taking the first letters.
The first letters of 'enigmatic variations' is 'ev'.
'elate' enclosing 'ev' is 'ELEVATE'.
(Other definitions for elevate that I've seen before include "Raise or lift" , "Put on a pedestal" , "To raise in level" , "Improve morally" , "Uplift" .)