Crossword Genius

I'm terribly upset with Momentum (7)

Ross

I believe the answer is:

impetus

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

'i'm terribly upset' is the wordplay.
'i'm' becomes 'im' ().
'terribly' is an anagram indicator.
'upset' anagrammed gives 'petus'.
'im'+'petus'='IMPETUS'

'with' is the link.

(Other definitions for impetus that I've seen before include "influence" , "Moving force" , "Driving force, forward movement" , "Driving force, momentum" , "Motivation" .)

I've seen this clue in The Sun.
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