Broadcast repeatedly, perhaps (5)

I believe the answer is:

resow

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'perhaps' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'broadcast repeatedly' is the wordplay.
'broadcast repeatedly' can mean two replacements for 'broadcast'.
'broadcast' becomes 're' (I am not sure about this - if you are sure you should believe this answer much more).
'broadcast' becomes 'sow' (sowing is a kind of broadcasting).
're'+'sow'='RESOW'

Can you help me to learn more?

(Other definitions for resow that I've seen before include "repeat broadcast" , "Put more seeds in" .)

I've seen this clue in the Evening Standard.

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