Upset stomach Romeo fills with vegetable fat (7)

I believe the answer is:

turmoil

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'upset' is the definition.
(I've seen this before)

'stomach romeo fills with vegetable fat' is the wordplay.
'stomach' becomes 'tum' (synonyms).
'romeo' becomes 'r' (phonetic alphabet: alpha, bravo, charlie etc.).
'fills' is an insertion indicator (one set of letters goes inside another).
'with vegetable fat' becomes 'oil' (I am not sure about this - if you are sure you should believe this answer much more).
'tum' enclosing 'r' is 'turm'.
'turm'+'oil'='TURMOIL'

Can you help me to learn more?

(Other definitions for turmoil that I've seen before include "Disquiet" , "Wild disorder" , "Agitation, confusion" , "State of great commotion or disturbance" , "Chaos" .)

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