Nothing special in clip of one of those from Trinity? Who cares! (4)

I believe the answer is:

soso

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'one of those from trinity? who cares' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'nothing special in clip' is the wordplay.
'nothing' becomes 'O' (looks like zero - 0).
'special' becomes 'S' (common abbreviation as in Special Air Service).
'in' indicates putting letters inside.
'clip' becomes 'so' (I can't justify this - if you can you should give a lot more credence to this answer).
'o'+'s'='os'
'os' going within 'so' is 'SOSO'.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for soso that I've seen before include "mediocre" , "Indifferent" .)

I've seen this clue in The Irish Times and the Irish Times (Crosaire).

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