Show Greek character crossing against current (5)
I believe the answer is:
evita
'show' is the definition.
(musical by Andrew Lloyd Webber)
'greek character crossing against current' is the wordplay.
'greek character' becomes 'eta' (letter from the Greek alphabet).
'crossing' indicates putting letters inside (to cross can mean to go over or around).
'against' becomes 'v' (versus).
'current' becomes 'I' (symbol for electric current).
'v'+'i'='vi'
'eta' enclosing 'vi' is 'EVITA'.
(Other definitions for evita that I've seen before include "Well-known musical" , "1996 musical film, starring Madonna" , "Famous musical" , "Musical based on Argentine leader" , "Show" .)