Probably Old Pale as in VSOP brandy [CPB]

Presumably “Cocknies”; citizens of east London

A euphemistic substitute for Gods wounds in asseverative or exclamatory formulae. [OED]

Off the Stones : Outside central London where the streets were cobbled streets. Also 'beyond the stones' [CPB]

the Devil

A neddy engine is a stationary steam engine

The devil; Satan

A popular brand of Gin

Either an unbooked passenger whom the driver of a coach took up for his own profit on the way. Or An omnibus conductor.

Songs (or poems) for which no reliable printed source has been found and which seem to have been passed from singer to singer 'by word of mouth'. These songs are often called 'traditional folk songs' although 'folk' singers often sang Music Hall songs and Parlour Ballads as well as pieces the style and content of which would be classed as folk song. This website has avoided the use of the term 'folk song'.

Legendary Irish warrior-poet (Gaelic Oisín) [Encylopeadia Brittanica https://www.britannica.com/topic/Ossian - accessed 07Oct2019]

Ostler: A stableman or groom at an inn [OED]

Thoroughly, completely, entirely; downright [OED] in this context, fashionable, of the highest quality, smart [CPB]

A person whose business is to superintend; an overseer. Especially in the textile industry. [OED]

Publius Ovidius Naso (43BC-17/18 AD), known as Ovid in the English-speaking world, was a Roman poet. He is often ranked as one of the three canonical poets of Latin literature.
https://en.wikipedia.org/wiki/Ovid

A mild form of oath or exclamation. [OED]