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Bellerophon's Mount could be sent flying (7)

Gone ages! "Sup horse?" (7)

What’s up
Horse is the Irish equivalent of pal/mate/chum
[maybe I should give it to the RTE Guide🙃]

Quiet, topless Sin City America could be a flyer (7)

Mythical creature fashioned from belly of huge beast essentially, plus wings on either side (7)

P (UGEAS*) S

Gaseous burst converting oxygen to phosphorous gives rise to a constellation (7)

Same clue, added clarity

Gaseous burst converting oxygen to phosphorous gives rise to a starry constellation (7)

Recognize us as flipping stars of the horsey set (7)

[@geting
Sorry for being pedantic, but the element is phosphorus (no O before the U). Phosphorous is an old name given to compounds of the element (now phosphorus(III), as opposed to phosphoric (phosphorus(V))]

American on oxygen after exercise with unusual horse (7)

Cloudscape gas used in Northern sky (7)