Bowl a second one in case of backspin (5)
I believe the answer is:
basin
'bowl' is the definition.
('basin' can be a synonym of 'bowl')
'a second one in case of backspin' is the wordplay.
'second' becomes 's' (common abbreviation).
'one' becomes 'i' (Roman numeral**).
'in' means one lot of letters goes inside another.
'case of' says to hollow out the word (remove centre letters) (outsides of).
'backspin' with its middle removed is 'bn'.
'a'+'s'+'i'='asi'
'asi' inserted within 'bn' is 'BASIN'.
(Other definitions for basin that I've seen before include "container" , "Depression in the earth's surface" , "Area drained by a river" , "Land drained by a river" , "Kitchen vessel" .)