### Clue: Characterising Indian, say, in the main? (7)
### Answer: OCEANIC 
 ### Explanation: Definition: in the main
 OCEAN(an example of which;say is the Indian Ocean) + -IC(the suffix that forms an adjective, denoting a characteristic, as in "metallic").
Answer: Describing something pertaining to the main;the sea, as in "oceanic fauna" or "oceanic currents".