Finished prescribed course feeling positive (6)
I believe the answer is:
upbeat
'feeling positive' is the definition.
'upbeat' can be an answer for 'positive' (I've seen this before). I'm unsure of the 'feeling' bit.
'finished prescribed course' is the wordplay.
'finished' becomes 'up' (eg 'time's up' means the time is finished).
'prescribed course' becomes 'beat' (I am not sure about the 'prescribed' bit.).
'up'+'beat'='UPBEAT'
Can you help me to learn more?
(Other definitions for upbeat that I've seen before include "Cheerfully optimistic" , "signal from sergeant, say, at end of bar?" , "Conductor's beginning" , "Cheerful and encouraging, like lively music" , "Heartening" .)