Two types of neckwear for keen rower (6)
I believe the answer is:
boatie
'two types' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.
'neckwear for keen rower' is the wordplay.
'neckwear' becomes 'boa' (boa can mean a scarf).
'for' means one lot of letters go next to another.
'keen rower' becomes 'tie' (I can't justify this - if you can you should give a lot more credence to this answer).
'boa'+'tie'='BOATIE'
'of' acts as a link.
Can you help me to learn more?
(Another definition for boatie that I've seen is " Someone on board".)