Brass instrument term put about (7)
I believe the answer is:
trumpet
'brass instrument' is the definition.
(I've seen this before)
'term put about' is the wordplay.
'about' is an anagram indicator.
'term'+'put'='termput'
'termput' is an anagram of 'TRUMPET'.
(Other definitions for trumpet that I've seen before include "Horn" , "Brass musical instrument" , "Brass wind instrument" , "Centre of daffodil flower" , "beastly noise" .)