Wind instrument delivered — advantage husband accepted (6,4)
I believe the answer is:
'wind instrument' is the definition.
(basset horn is a kind of wind instrument)
'delivered advantage husband accepted' is the wordplay.
'delivered' becomes 'born'.
'advantage' becomes 'asset' (I've seen this before**).
'husband' becomes 'h'.
'accepted' indicates putting letters inside.
'born' going around 'asseth' is 'BASSET-HORN'.
(Another definition for basset horn that I've seen is " instrument".)