Knock down duck and gander (5)

I believe the answer is:

decko

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

'gander' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'knock down duck' is the wordplay.
'knock down' becomes 'deck' (deck can mean to knock over).
'duck' becomes 'o' (resembles zero - 'duck' in cricket).
'deck'+'o'='DECKO'

'and' acts as a link.

Can you help me to learn more?

(Another definition for decko that I've seen is " A look".)

I've seen this clue in The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.