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We present evidence for globular cluster stellar debris in a dwarf galaxysystem (Sagittarius: Sgr) based on an analysis of high-resolution\textit{H}-band spectra from the Apache Point Observatory Galactic EvolutionExperiment (APOGEE) survey. We add [N/Fe], [Ti/Fe], and [Ni/Fe] abundanceratios to the existing sample of potential members of M~54; this is the firsttime that [N/Fe] abundances are derived for a large number of stars in M~54.Our study reveals the existence of a significant population of nitrogen- (witha large spread, $\gtrsim1$ dex) and aluminum-enriched stars with moderate Mgdepletion in the core of the M~54$+$Sagittarius system, which shares the lightelement anomalies characteristic of second-generation globular cluster stars(GCs), thus tracing the typical phenomenon of multiple stellar populations seenin other Galactic GCs at similar metallicity, confirming earlier results basedon the Na-O anti-correlation. We further show that most of the stars in M~54exhibit different chemical - patterns evidently not present in Sgr field stars.Furthermore, we report the serendipitous discovery of a nitrogen-enhancedextra-tidal star with GC second-generation-like chemical patterns for whichboth chemical and kinematic evidence is commensurate with the hypothesis thatthe star has been ejected from M~54. Our findings support the existence ofchemical anomalies associated with likely tidally shredded GCs in dwarfgalaxies in the Local Group and motivate future searches for such bonafidestars along other known Milky Way streams.

APOGEE spectroscopic evidence for chemical anomalies in dwarf galaxies: The case of M~54 and Sagittarius