Nervously making a bet (8)
I believe the answer is:
aflutter
'nervously making' is the definition.
I can't judge whether this defines the answer.
'a bet' is the wordplay.
'bet' becomes 'flutter' (to have a flutter is to put a bet on).
'a'+'flutter'='AFLUTTER'
Can you help me to learn more?
(Other definitions for aflutter that I've seen before include "trembling" , "Agitated - excited (eg in anticipation)" , "Nervous, twitchy" , "in excited state" , "is rather nervous" .)