Crossword Genius

Build up a band on the radio (6)

Ross

I believe the answer is:

accrue

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'build up' is the definition.
(I've seen this in another clue)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for accrue that I've seen before include "Collect" , "what interest payments do" , "Fall due; accumulate" , "mount up" , "Accumulate or grow like interest" .)

I've seen this clue in The Telegraph.
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