Traveller in the main story sounding keen to tour India (5,5)
I believe the answer is:
pilot whale
'traveller in the main' is the definition.
('the main' is an old name for the sea)
'story sounding keen to tour india' is the wordplay.
'story' becomes 'plot' (plot is a kind of story).
'sounding keen' becomes 'whale' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'to tour' indicates putting letters inside (to tour can mean to go around).
'india' becomes 'i' (phonetic alphabet: alpha, bravo, charlie etc.).
'plot'+'whale'='plotwhale'
'plotwhale' going around 'i' is 'PILOT WHALE'.
(Other definitions for pilot whale that I've seen before include "squid eater" , "Blackfish" .)