Trainee holding her lovely child (6)
I believe the answer is:
cherub
'lovely child' is the definition.
(I've seen this before)
'trainee holding her' is the wordplay.
'trainee' becomes 'cub' (I've seen this in other clues).
'holding' indicates putting letters inside.
'cub' placed around 'her' is 'CHERUB'.
(Other definitions for cherub that I've seen before include "Sweet, innocent child" , "A heavenly winged child" , "Sweet little baby" , "A heavenly baby" , "innocent young thing" .)