It's bound to be curtailed in officer training (4)

I believe the answer is:

cert

I'm a little stuck... Click here to teach me more about this clue!

'it's bound to be curtailed' is the definition.
I can't judge whether this defines the answer.

'in officer training' is the wordplay.
'in' indicates the answer is hidden within the clue.
'CERT' is hidden in the letters of 'officer training'.

Can you help me to learn more?

(Other definitions for cert that I've seen before include "One sure to win (slang)" , "Sure thing (colloq.)" , "Sure thing (sl.)" , "Safe bet" , "Infallible bet (slang)" .)

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