Tediously continue racing yacht (6)

I believe the answer is:

dragon

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'racing yacht' is the definition.
(I've seen this before)

'tediously continue' is the wordplay.
'tediously' becomes 'drag' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'continue' becomes 'on' (I've seen this in other clues).
'drag'+'on'='DRAGON'

Can you help me to learn more?

(Other definitions for dragon that I've seen before include "battleaxe" , "Seventeen [HARRIDAN]" , "Fury" , "St George killed this flying monster" , "St George slew one" .)

I've seen this clue in The Telegraph.

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