That's right, six months at Strangeways, initially! (3)

I believe the answer is:

yes

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'that's right' is the definition.
(right can mean yes or okay)

'six months at strangeways initially' is the wordplay.
'six months at' becomes 'ye' (I can't explain this - if you can you should give a lot more credence to this answer).
'initially' says to take the initial letters.
The initial letter of 'strangeways' is 's'.
'ye'+'s'='YES'

Can you help me to learn more?

(Other definitions for yes that I've seen before include "Affirmative answer" , "3 across" , "Certainly!" , "Yea" , "OK" .)

I've seen this clue in the Evening Standard.

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