Made ready to drive steeds in the middle (4)

I believe the answer is:

teed

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'made ready' is the definition.
Although both the answer and definition are past participle verbs, I can't understand how one could define the other.

'drive steeds in the middle' is the wordplay.
'in the middle' indicates a hidden word (the answer is in the middle of the clue).
'TEED' can be found hidden inside 'drive steeds'.

'to' is the link.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

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