Crossword Genius

Piped down when given stockings (5)

Ross

I believe the answer is:

hosed

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

'piped' is the definition.
Although both the answer and definition are past participle verbs, I can't understand how one could define the other.

'down when given stockings' is the wordplay.
'down when' becomes 'd' (I am not sure about the 'when' bit.).
'given' is a charade indicator (letters next to each other).
'stockings' becomes 'hose' (I've seen this in another clue).
'd' after 'hose' is 'HOSED'.

Can you help me to learn more?

(Other definitions for hosed that I've seen before include "Watered with a flexible pipe" , "wearing tights?" , "washed" , "swilled down with water" .)

I've seen this clue in the Sydney Morning Herald.
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