English sailor welcoming help over beam (7)

I believe the answer is:

radiate

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'beam' is the definition.
(I know that beam can be written as radiate)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for radiate that I've seen before include "Give out (light, etc)" , "broadcast" , "Spread outwards" , "Disseminate" , "Emit light/heat" .)

I've seen this clue in The Telegraph.

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