A little extra I need to give apprentice (7)
I believe the answer is:
trainee
'apprentice' is the definition.
(someone undergoing training)
'a little extra i need to' is the wordplay.
'a little' indicates the answer is hidden within the clue.
'TRAINEE' can be found hidden inside 'extra i need to'.
'give' acts as a link.
(Other definitions for trainee that I've seen before include "As pupil" , "Person under instruction" , "One undergoing instruction" , "One being instructed" , "Aintree (anag.)" .)