Gushing writer? (8,3)
I believe the answer is:
fountain pen
'gushing writer?' is the definition.
'fountain pen' can be an answer for 'writer?' (something which writes). I'm unsure of the 'gushing' bit.
'gushing writer?' is the wordplay.
'gushing' becomes 'fountain' (I am not sure about this - if you are sure you should believe this answer much more).
'writer?' becomes 'pen' (something which writes).
'fountain'+'pen'='FOUNTAIN-PEN'
Can you help me to learn more?
(Other definitions for fountain pen that I've seen before include "Writing implement" , "Writer" , "Ink writing device" .)