Crossword Genius

Assailant here needs a good hiding (6)

Ross

I believe the answer is:

ambush

This could be a double definition.

'assailant here' is the first definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

'a good hiding' is the second definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps there's a link between them I don't understand?

'needs' acts as a link.

(Other definitions for ambush that I've seen before include "Wait in hiding to attack" , "Lying in wait to attack" , "Weakening" , "Attack from concealed position" , "Waylaying" .)

I've seen this clue in The Guardian.
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