Crossword Genius

One drawing loads of craft in cold bay, say (9)

Ross

I believe the answer is:

carthorse

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'one drawing loads' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'craft in cold bay say' is the wordplay.
'craft' becomes 'art' (both can mean cunning or trickery).
'in' means one lot of letters goes inside another.
'cold' becomes 'C' (eg on taps).
'bay say' becomes 'horse' (bay is a kind of horse).
'c'+'horse'='chorse'
'art' placed inside 'chorse' is 'CARTHORSE'.

'of' is the link.

Can you help me to learn more?

(Other definitions for carthorse that I've seen before include "Beast of burden" , "Equine" , "large drawer" , "has pulling power" .)

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