Soldier repeatedly seen in musical (4)
I believe the answer is:
gigi
'musical' is the definition.
(1973 musical)
'soldier repeatedly' is the wordplay.
'soldier' becomes 'gi' (term for US soldier).
'repeatedly' says to double the letters.
'gi' duplicated is 'GIGI'.
'seen in' acts as a link.
(Other definitions for gigi that I've seen before include "Musical, winner of nine Academy Awards" , "Lerner and Loewe musical and film" , "Lerner/Loewe musical" , "Movie" , "1958 film musical from a Colette novel" .)