Crossword Genius

Concerned with betting on the German signal receiver (9)

Ross

I believe the answer is:

responder

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

'signal receiver' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'concerned with betting on the german' is the wordplay.
'concerned with' becomes 're' (re can mean regarding, concerning).
'betting' becomes 'sp'.
'the german' becomes 'der' ('the' in German).
're'+'sp'+'on'+'der'='RESPONDER'

Can you help me to learn more?

(Other definitions for responder that I've seen before include "Reactor" , "one giving a reaction" , "one should give a reply" , "One replying or reacting" , "provides one with the answer" .)

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