1d) If presto is played in 'The Ring' Russian piece emerges. no letters (3,4,2,6)
10a) First of two marine mammals in rocks (7) T???E??
18a) Preliminary sketches called 'Shorebirds' (5) R????
26a) Let's go off round Portugal with girl to find the real facts (6,5) no letrs
Your help is greatly appreciated