Playing advantage, so I've got a feeling of nervous anticipation (2,4)
I believe the answer is:
on edge
'i've got a feeling of nervous anticipation' is the definition.
I know nothing about this answer so I can't judge whether this works.
'playing advantage' is the wordplay.
'playing' becomes 'on'.
'advantage' becomes 'edge' (edge is a kind of advantage).
'on'+'edge'='ON EDGE'
'so' is the link.
Can you help me to learn more?
(Other definitions for on edge that I've seen before include "stressed" , "Nervy, tense and irritable" , "close to border" , "'Tense, nervous (2,4)'" , "Tense and irritable, with nerves stretched" .)