Tidily, trimly (6)
I believe the answer is:
neatly
I believe this is a double definition.
'tidily' is the first definition.
(I've seen this before)
'trimly' is the second definition.
(thesaurus)
(Other definitions for neatly that I've seen before include "'Tidily, trimly (6)'" , "Tidily and cleanly" , "nicely" , "Orderly and cleanly" , "In tidy fashion" .)