A worker has fallen but pass on (4,4)

I believe the answer is:

hand down

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'pass on' is the definition.
(handing down is a kind of passing on)

'a worker has fallen' is the wordplay.
'a worker' becomes 'hand' (hand is a kind of worker).
'has' says to put letters next to each other.
'fallen' becomes 'down' (I can't explain this - if you can you should believe this answer much more).
'hand'+'down'='HAND-DOWN'

'but' is the link.

Can you help me to learn more?

(Another definition for hand down that I've seen is " Issue (judgment); bequeath".)

I've seen this clue in The Globe and Mail.

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