A familiar name for the duck (4)

I believe the answer is:

theo

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'a familiar name' is the definition.
'Theo' can be an answer for 'name'. I am not certain of the 'a familiar' bit.

'the duck' is the wordplay.
'duck' becomes 'o' (resembles zero - 'duck' in cricket).
'the'+'o'='THEO'

'for' acts as a link.

Can you help me to learn more?

(Other definitions for theo that I've seen before include "Kojak" , "Fellow" , "boy?" , "Man" .)

I've seen this clue in the Evening Standard.

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