Possibly wide on the right, not top or bottom (5)
I believe the answer is:
extra
'possibly wide' is the definition.
'extra' can be an answer for 'wide' (cricket, extra awarded for wide ball). I'm not sure about the 'possibly' bit.
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for extra that I've seen before include "to boot" , "eg Wide; additional" , "Spare" , "someone acting in a crowd" , "One playing a minor part" .)