Transport judge on yacht, first of all (3)
I believe the answer is:
joy
'transport' is the definition.
(both can mean bliss or ecstasy)
'judge on yacht first of all' is the wordplay.
'first of all' suggests taking the first letters.
The first letters of 'judge on yacht' is 'JOY'.
(Other definitions for joy that I've seen before include "Great happiness" , "Delight" , "Subject of 11 [ODE]" , "Rapture" , "Intense gladness" .)