Reversible note? (5)
I believe the answer is:
minim
I believe this is a double definition.
'reversible' is the first definition.
'note?' is the second definition.
(type of musical note)
(Other definitions for minim that I've seen before include "A note in music, half as long as a semi-breve- it's a palindrome" , "Short note" , "note or > dose" , "It's a downward stroke" , "Musical note - small amount of liquid" .)