4d battle with endless history bold few make it (8,5) ?o?w?r?? ???l?
10a mother breaks barrier to old republic(6) ?e?m?r
14a troublesome gift for poseidon is cracked cup(8,7) ?o?s?n?d ???l?c?
19a develop as drummer, however stifling(5,3) ?r?n? o?t
4dn Bosworth Field (anag "bold few + histor(y)")
10ac Weimar (ma in Weir)
14ac poisoned chalice (anag "poseidon" + chalice)
10ac bring out (Ringo in but)