Pound raised is small joy (5)
I believe the answer is:
bliss
'joy' is the definition.
(I've seen this in another clue)
'pound raised is small' is the wordplay.
'pound' becomes 'lb' (abbreviation for the unit of weight).
'raised' is a reversal indicator (going up in a down clue).
'small' becomes 's' (abbreviation - e.g. clothes size).
'lb' reversed gives 'bl'.
'bl'+'is'+'s'='BLISS'
(Other definitions for bliss that I've seen before include "promise of afterlife" , "Great joy" , "British composer, Arthur (1881-1975) - perfect happiness" , "seventh heaven" , "Felicity" .)