Praise former partner over large amount raised (5)
I believe the answer is:
extol
'praise' is the definition.
(I know that extol is a more specific form of the action praise)
'former partner over large amount raised' is the wordplay.
'former partner' becomes 'ex' (an ex-partner).
'over' is a charade indicator (letters next to each other) (in a down clue, some letters go over others).
'large amount' becomes 'lot' (a lot of something).
'raised' says the letters should be written backwards (going up in a down clue).
'lot' in reverse letter order is 'tol'.
'ex'+'tol'='EXTOL'
(Other definitions for extol that I've seen before include "Sing the praises of" , "Proclaim" , "Speak well of" , "Praise greatly" , "be lavish with praise" .)