In the morning, at one, they make instruments (5)
I believe the answer is:
amati
'they make instruments' is the definition.
The definition suggests an adverb but the answer is not.
'in the morning at one' is the wordplay.
'in the morning' becomes 'am' (AM on a clock).
'one' becomes 'i' (Roman numeral).
'am'+'at'+'i'='AMATI'
Can you help me to learn more?
(Other definitions for amati that I've seen before include "Famous violin maker" , "Famous violin family" , "instrument-maker" , "Noted violin maker" , "Violin or cello made by a Cremona family" .)