Fear speaking to company opening aquarium on land (5,5)

I believe the answer is:

terra firma

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'land' is the definition.
(synonyms)

'fear speaking to company opening aquarium' is the wordplay.
'fear speaking' becomes 'terra' (I can't explain this - if you can you should believe this answer much more).
'to company' becomes 'firm' (I've seen this before).
'opening' says to take the initial letters.
The first letter of 'aquarium' is 'a'.
'terra'+'firm'+'a'='TERRA-FIRMA'

'on' is the link.

Can you help me to learn more?

(Other definitions for terra firma that I've seen before include "Hard ground" , "Solid earth - dry land" , "Solid ground" , "Solid earth (Latin)" .)

I've seen this clue in the Sydney Morning Herald.

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