Originator of theory's sore over hypothetical particle (7)

I believe the answer is:

tachyon

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'particle' is the definition.
(hypothetical faster-than-light particle)

'originator of theory's sore over hypothetical' is the wordplay.
'originator of' says to take the initial letters (I've seen 'originator' mean this).
'sore' becomes 'achy' (I've seen this in another clue).
'over hypothetical' becomes 'on' (I can't justify this - if you can you should give a lot more credence to this answer).
The initial letter of 'theorys' is 't'.
't'+'achy'+'on'='TACHYON'

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(Another definition for tachyon that I've seen is " One moving faster than light".)

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