Look over at individual's top, but maintain composure (4,4,4)
I believe the answer is:
keep ones head
'look over' is the definition.
I don't know anything about this answer so I cannot judge whether this works.
'individual's top but maintain composure' is the wordplay.
I cannot quite see how this works, but
'individual's' could be 'ones' (an individual is one person) and 'ones' is found within the answer.
'top' could be 'head' (head is a kind of top) and 'head' is present in the answer.
'maintain' could be 'keep' (synonyms) and 'keep' is found in the answer.
No letters remain.
This explanation may well be incorrect...
'at' acts as a link.
Can you help me to learn more?
(Another definition for keep ones head that I've seen is " Remain calm and in control".)