Regularly break into an Indian side (5)
I believe the answer is:
raita
'indian side' is the definition.
(raita is an Indian side dish)
'regularly break into an' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'an' becomes 'a'.
'break'+'into'='breakinto'
The alternate letters of 'breakinto' are 'rait'.
'rait'+'a'='RAITA'
(Other definitions for raita that I've seen before include "Yoghurt-based Indian condiment" , "Dishy thing" , "Indian yogurt dip" , "dish in the curry house" , "Cucumber and mint Indian dip" .)