Easily disgusted? Don't eat fish before ten with us (10)

I believe the answer is:

fastidious

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'easily disgusted?' is the definition.
(fastidious can mean obsessed with cleanliness)

'don't eat fish before ten with us' is the wordplay.
'don't eat' becomes 'fast' (fasting is not eating).
'fish before' becomes 'id' (I can't explain this - if you can you should give a lot more credence to this answer).
'ten' becomes 'io' (IO resembles i0).
'with' says to put letters next to each other.
'fast'+'id'+'io'+'us'='FASTIDIOUS'

Can you help me to learn more?

(Other definitions for fastidious that I've seen before include "Meticulous" , "Attentive to detail" .)

I've seen this clue in The Telegraph.

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