Supply odd man out (6)
I believe the answer is:
amount
'supply' is the definition.
(thesaurus)
'odd man out' is the wordplay.
'odd' indicates an anagram.
'man'+'out'='manout'
'manout' with letters rearranged gives 'AMOUNT'.
(Other definitions for amount that I've seen before include "A quantity or total of anything" , "Sum of money" , "Total or extent" , "Measure, quantity" , "Supply" .)