Instrument with blade in adult carries around (7)
I believe the answer is:
ocarina
'instrument' is the definition.
(ocarina is a kind of instrument)
'blade in adult carries around' is the wordplay.
'blade' becomes 'oar' (blade is the word for oar in competitive rowing).
'adult' becomes 'a'.
'carries' means one lot of letters goes inside another.
'around' becomes 'c' (abbreviation for 'circa'**).
'oar'+'in'+'a'='oarina'
'oarina' placed around 'c' is 'OCARINA'.
'with' is the link.
(Other definitions for ocarina that I've seen before include "Egg-shaped type of flute" , "dated instrument" , "Inca oar made into a musical instrument" , "Toy-like wind instrument" , "Old wind instrument" .)