Familiar name for the duck (4)

I believe the answer is:

theo

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

'familiar name' is the definition.
'Theo' can be an answer for 'name'. I'm not sure about the '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" , "Man" , "Fellow" , "boy?" .)

I've seen this clue in the Evening Standard.

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