Releases former partner, united with Des (6)
I believe the answer is:
exudes
'releases' is the definition.
The answer and definition can be both related to bodily activities as well as being verbs in their -s form.
Perhaps you can see a link between them that I can't see?
'former partner united with des' is the wordplay.
'former partner' becomes 'ex' (an ex-partner).
'united' becomes 'U' (abbreviation).
'with' means one lot of letters go next to another.
'ex'+'u'+'des'='EXUDES'
Can you help me to learn more?
(Other definitions for exudes that I've seen before include "Oozes out or emits" , "Oozes out or shows freely" .)