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For the best reception, it needs real A1 adjustment (6)

Ross

I believe the answer is:

aerial

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

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for aerial that I've seen before include "imaginary" , "Radio waves receiver" , "Rod for receiving radio waves" , "Device to receive or transmit radio waves" , "Device for radio transmissions" .)

I've seen this clue in the Evening Standard.
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