But his mind was gloomy, regularly, after returning to capital (9)

I believe the answer is:

mogadishu

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'capital' is the definition.
(capital of Somalia)

'but his mind was gloomy regularly after returning' is the wordplay.
'but' becomes 'u' (I am not sure about this - if you are sure you should believe this answer much more).
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
'after' is a charade indicator (letters next to each other).
'returning' says the letters should be written backwards.
'his'+'mind'+'was'+'gloomy'='hismindwasgloomy'
The alternate letters of 'hismindwasgloomy' are 'hsidagom'.
'u'+'hsidagom'='uhsidagom'
'uhsidagom' back-to-front is 'MOGADISHU'.

'to' acts as a link.

Can you help me to learn more?

(Other definitions for mogadishu that I've seen before include "Somali city" , "Capital of Somalia" , "foreign capital" .)

I've seen this clue in The Hindu.

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