Chap to blow away, though carrying large stringed instrument (8)
I believe the answer is:
mandolin
'stringed instrument' is the definition.
(mandolin is a kind of stringed instrument)
'chap to blow away' is the wordplay.
'chap' becomes 'Man' (chap can mean a man).
'to blow away' becomes 'dolin' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'man'+'dolin'='MANDOLIN'
'though carrying large' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for mandolin that I've seen before include "Lute-like instrument" , "Stringed instrument, usually played with a plectrum" , "Almond in the stringed instrument, oddly" , "vegetable slicer" , "Musical instrument like a small lute" .)