Fruit, a volume taking month to come up (5)
I believe the answer is:
guava
'fruit' is the definition.
(guava is a kind of fruit)
'a volume taking month to come up' is the wordplay.
'volume' becomes 'v'.
'taking' means one lot of letters go next to another.
'month' becomes 'aug' (Aug is an example**).
'to come up' says the letters should be written in reverse.
'a'+'v'+'aug'='avaug'
'avaug' reversed gives 'GUAVA'.
(Other definitions for guava that I've seen before include "Tropical fruit with yellow skin and pink flesh" , "Pale orange tropical fruit" , "Large cask; tube" , "South American fruit" , "Tropical shrub bearing small yellowish fruit" .)