Crossword Genius

Top professionals turned up carrying Caesar's first ballista (8)

Ross

I believe the answer is:

scorpion

I'm a little stuck... Click here to teach me more about this clue!

'ballista' is the definition.
Both the answer and definition are singular nouns.
Perhaps they are linked in a way I don't understand?

'top professionals turned up carrying caesar's first' is the wordplay.
'top' becomes 'noi' (resembles No p).
'professionals' becomes 'pros' ('pro' can be a synonym of 'professional').
'turned up' is a reversal indicator.
'carrying' means one lot of letters goes inside another.
'caesar's first' becomes 'c' (pst letter of 'caesar').
'noi'+'pros'='noipros'
'noipros' backwards is 'sorpion'.
'sorpion' placed around 'c' is 'SCORPION'.

Can you help me to learn more?

(Other definitions for scorpion that I've seen before include "Venomous stinger" , "Stinger with a long tail" , "Arachnid with venomous sting" , "Small spider with pincers and stinging tail" , "Eight sign of Zodiac, kind of spider" .)

I've seen this clue in The Times.
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