Indian fitting in, by the sound of it, as commander of vessel (3,7)
I believe the answer is:
sea captain
'indian fitting in by the sound' is the definition.
I can't tell whether this definition defines the answer.
'of it as commander of vessel' is the wordplay.
'of' indicates an anagram (the answer comes from or 'of' the letters).
'it' becomes 'e' ('e' can mean 'electronic' which is similar to 'IT').
'commander of vessel' becomes 'captain' (I can't justify this - if you can you should give a lot more credence to this answer).
'e'+'as'='eas'
'eas' anagrammed gives 'sea'.
'sea'+'captain'='SEA-CAPTAIN'
Can you help me to learn more?
(Another definition for sea captain that I've seen is " Cook was one".)