Travelling underwater? Rum rationed, making one unruly (13)

I believe the answer is:

insubordinate

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'unruly' is the definition.
(similar in meaning)

'travelling underwater? rum rationed' is the wordplay.
'travelling' becomes 'in' (I can't explain this - if you can you should give a lot more credence to this answer).
'underwater?' becomes 'sub' (as in submarine).
'rum' indicates anagramming the letters (rum can mean strange or unusual).
'rationed' is an anagram of 'ordinate'.
'in'+'sub'+'ordinate'='INSUBORDINATE'

'making one' is the link.

Can you help me to learn more?

(Other definitions for insubordinate that I've seen before include "Rebellious" , "Defiant of authority" , "Disobedient" , "undisciplined" , "Insolent" .)

I've seen this clue in The Telegraph.

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