Wanders across fence and ducks (8)

I believe the answer is:

gadwalls

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

'ducks' is the definition.
Both the answer and definition are plural nouns.
Perhaps there's an association between them I don't understand?

'wanders across fence' is the wordplay.
'wanders' becomes 'gads' (gadding is a kind of wandering).
'across' is an insertion indicator.
'fence' becomes 'wall' (synonyms).
'gads' going around 'wall' is 'GADWALLS'.

'and' is the link.

Can you help me to learn more?

I've seen this clue in The Hindu.

Want a hint initially instead of a full solution? Install my app