It's bound to be curtailed in officer training (4)
I believe the answer is:
Here is my best explanation:
'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' says the answer is hidden in the clue.
'CERT' is hidden in the letters of 'officer training'.
Can you help me to learn more?