Son leaving beach, perhaps, shepherding daughter in crowd (5)

I believe the answer is:

horde

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'crowd' is the definition.
(horde is a kind of crowd)

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

(Other definitions for horde that I've seen before include "A swarm or multitude" , "Vast crowd" , "Large army" , "Migratory tribe; army" , "Great crowd" .)

I've seen this clue in The Telegraph.

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