Also terribly neat tempo (7)
I believe the answer is:
andante
'tempo' is the definition.
(I know that andante is a type of tempo)
'also terribly neat' is the wordplay.
'also' becomes 'and' (both can mean in addition).
'terribly' is an anagram indicator.
'neat' with letters rearranged gives 'ante'.
'and'+'ante'='ANDANTE'
(Other definitions for andante that I've seen before include "not hurrying from bar to bar" , "Moderately slow movement" , "at a gentle pace" , "Slow, even time (mus.)" , "Moderately slow (mus.)" .)