Heyday: The period that maintains the greatest strength or success. The good times...
Greta Garbo in her heyday
Clientele is singular: a 'grouping' term like 'flock' or 'horde' that lumps multiple individual units into a single term. So, "During its heyday, the shop's clientele was representative of the finest in high society."
HAY for like the hay you feed horses horses.
hey·day (hā'dā')n. The period of greatest popularity, success, or power; prime.c.1590, alteration of heyda (1526), exclamation of playfulness or surprise, something like Mod.Eng. hurrah, apparently an extended form of M.E. interjection hey, hei. Modern sense of "stage of greatest vigor" first recorded 1751, which altered the spelling on model of day, with which this word apparently has no etymological connection.
Mean
Greta Garbo in her heyday
Heyday Films was created in 1997.
Heyday Books was created in 1974.
Heyday Records was created in 1988.
Heyday - The Church album - was created in 301.
I believe the book is Heyday in the Blood. If so, the author is Geraint Goodwin.
Heyday - Fairport Convention album - was created in 1987.
The cast of Heyday - 2005 includes: Shirley Anne Field Kenny Lynch
In those days or in those happy days or in those sucessful days In my experience, it's usually spelled 'heyday'.
The cast of Heyday in the Blood - 1979 includes: Gillian Elisa as Beti Donald Houston Dyfed Thomas
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The heyday of scientific police management is generally considered to be the late 19th and early 20th centuries, with advancements in forensic science, criminal investigations, and the professionalization of police forces. This period saw the establishment of key methodologies and practices that form the foundation of modern police work.