Grandmother consumed banana (3)
I believe the answer is:
nan
'grandmother' is the definition.
(nan can informally mean a grandmother)
'consumed banana' is the wordplay.
'NAN' is hidden within the letters.
However, I am unsure how the hidden word is indicated.
Can you help me to learn more?
(Other definitions for nan that I've seen before include "Indian bread - older relative" , "Ancestor" , "Indian bread; grandma" , "Granny; bread" , "type of slightly leavened bread" .)