Crustacean luckily protecting back bones (5)
Did anyone get this one quickly - its taken me 3 days.
It is of course "ULNAE" the plural of ULNA = Bones.
Protecting implies the answer is hidden, Back = reverse the order . Bones is the definition!!!! Any observations.? Were other clues harder.
I once read that the hardest clue is the last one you solve.
All the best ( Am thinking about tomorrows Peer Review. -- and watching MPs going out and coming back - without success.
Ah Me Best wishes Thea(o)