Shout loudly for right paddle (4)
I believe the answer is:
roar
'shout loudly' is the definition.
(I've seen this before)
'for right paddle' is the wordplay.
'right' suggests the final letters (the letter on the right of the word).
'paddle' becomes 'oar' (I've seen this before).
The last letter of 'for' is 'r'.
'r'+'oar'='ROAR'
(Other definitions for roar that I've seen before include "24 [BOOM]" , "Lion's sound" , "Loud growl" , "Loud cry" , "Cry (as a lion)" .)