Erase her letters in train (8)
I believe the answer is:
rehearse
'train' is the definition.
(eg actors rehearse to train for a show)
'erase her letters' is the wordplay.
'letters' indicates an anagram.
'erase'+'her'='eraseher'
'eraseher' is an anagram of 'REHEARSE'.
'in' is the link.
(Other definitions for rehearse that I've seen before include "Go over" , "Cast practise for play" , "Run through (a play)" , "Practice in theatre" , "Practise before a public performance" .)