A little fruit one’s taken into shower (6)
I believe the answer is:
raisin
'a little fruit' is the definition.
(a raisin is a small fruit)
'one's taken into shower' is the wordplay.
'one's' becomes 'I's' (Roman numeral).
'taken into' is an insertion indicator.
'shower' becomes 'rain' (synonyms).
'is' going inside 'rain' is 'RAISIN'.
(Other definitions for raisin that I've seen before include "Partially dried grape" , "Dried fruit" , "A dried grape, nice in cake" , "Fruit for the Christmas cake" , "Dried red grape" .)