Crossword Genius

Good thing to do when dog tired (3)

Ross

I believe the answer is:

sit

I'm a little stuck... Click here to teach me more about this clue!

'do when dog tired' is the definition.
I can't tell whether this definition defines the answer.

'good thing' is the wordplay.
I cannot really see how this works, but
'thing' could be 'it' and 'it' is found within the answer.
A single letter 's' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

'to' acts as a link.

Can you help me to learn more?

(Other definitions for sit that I've seen before include "Brood" , "Take weight off feet" , "Take a pew, an exam" , "Order dog to behave" , "Model" .)

I've seen this clue in the Evening Standard.
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