24d Ten green bottles - 'ten greenbottles' (flies, 6 legs each)
23a Distraught - 'draught' (slug, sandwiches; contains) 'i(nfiltrating) S(panish) t(apas)' (starters)
30a Stranger - 's(econd)' + 't(eam; originally)' + 'ranger' (keeper)
54a Nairobi - 'I born (delivered)' (back, packages; contains) 'A1'