Dejected soul to take a smaller amount (10)
I believe the answer is:
'dejected' is the definition.
'soul to take a smaller amount' is the wordplay.
'soul' becomes 'spirit' ().
'to take' is a charade indicator (letters next to each other).
'a smaller amount' becomes 'less' (I've seen this in another clue).
(Another definition for spiritless that I've seen is " Lacking ardour".)