Cut back openings for computing trainees? Absolutely right (5)
I believe the answer is:
exact
'absolutely right' is the definition.
(I've seen this before)
'cut back openings for computing trainees?' is the wordplay.
'cut' becomes 'axe' (both can mean to cancel or remove).
'back' shows that the letters should be reversed in order.
'openings for' suggests taking the first letters (the letters which open the words).
The first letters of 'computing trainees' is 'ct'.
'axe' reversed gives 'exa'.
'exa'+'ct'='EXACT'
(Other definitions for exact that I've seen before include "Precise, accurate" , "Absolutely right" , "on the money" , "Faithful" , "accurate in all details" .)