Cheer for revolution in Teheran (7)

I believe the answer is:

hearten

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

'cheer' is the definition.
(I know that cheer can be written as hearten)

'revolution in teheran' is the wordplay.
'teheran' can be anagrammed to 'HEARTEN'.
However, I am not clear how this is indicated.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for hearten that I've seen before include "Be encouraged" , "giving cheer" , "Encourage in Teheran" , "Make (someone) more confident" , "Buoy" .)

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