Crossword Genius

With meaningless opening word, joined broadcast (5)

Ross

I believe the answer is:

sowed

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'broadcast' is the definition.
(broadcast can mean to sow seeds)

'with meaningless opening word joined' is the wordplay.
'with meaningless opening word' becomes 'so' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'joined' becomes 'we'd' (I've seen this in another clue).
'so'+'wed'='SOWED'

Can you help me to learn more?

(Other definitions for sowed that I've seen before include "Scattered seed" , "Placed seeds in the ground" , "broadcast" .)

I've seen this clue in The Guardian.
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