Brother accommodating one popular writer? (4)
I believe the answer is:
biro
'popular writer?' is the definition.
'biro' can be an answer for 'writer?' (type of pen, something which writes). I am not sure about the 'popular' bit.
'brother accommodating one' is the wordplay.
'brother' becomes 'bro' (short for brother).
'accommodating' is an insertion indicator.
'one' becomes 'i' (Roman numeral).
'bro' going around 'i' is 'BIRO'.
Can you help me to learn more?
(Other definitions for biro that I've seen before include "Laszlo Jozsef -, ballpoint pen inventor" , "Writing implement" , "Type of ballpoint pen" , "writer" , "Lazlo -, ballpoint pen inventor" .)