Rep moaned egregiously during stroll (9)

I believe the answer is:

promenade

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'stroll' is the definition.
(I know that stroll can be written as promenade)

'rep moaned egregiously during' is the wordplay.
'rep moaned' can be anagrammed to 'PROMENADE'.
But, I am not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for promenade that I've seen before include "Seaside walk?" , "Seafront walkway" , "Esplanade" , "Seafront walk" , "Place for strolling by the sea" .)

I've seen this clue in The Irish Times.

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