Quietly, Henry and I call (5)
I believe the answer is:
phone
'call' is the definition.
(phone can mean to call by telephone)
'quietly henry and i' is the wordplay.
'quietly' becomes 'p' (musical symbol).
'henry' becomes 'H' (symbol for the unit of electrical inductance).
'and' is a charade indicator (letters next to each other).
'i' becomes 'one' (Roman numeral for one).
'p'+'h'+'one'='PHONE'
(Other definitions for phone that I've seen before include "Ring (someone)" , "Call (someone)" , "It converts sounds into signals and back again" , "Short piece of electronic equipment" , "Call; eg, mobile" .)