Throw to the liner (4)
I believe the answer is:
toss
'throw' is the definition.
(I know that toss is a type of throw)
'the liner' is the wordplay.
'the' becomes 't' (the is pronounced as a 't' sound in some dialects).
'liner' becomes 'oss' (I am not sure about this - if you are sure you should believe this answer much more).
't'+'oss'='TOSS'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for toss that I've seen before include "Careless not to give this" , "Spin of a coin" , "ball" , "Heads or tails throw" , "cast" .)