Clue: Maybe she's Mary, 5 of the P (4,4)
Answer: MYRA HESS
Explanation: Definition: 5 of the P
An anagram ('maybe') of 'she's Mary', for the piano player, best remembered for her piano arrangement of *Jesu, Joy of Man's Desiring*, and the organization of a series of lunchtime concerts throughout the Second World War – starting in the Blitz.