Former partner has hot drinks and puffs (7)
I believe the answer is:
exhales
'puffs' is the definition.
(puff can mean to exhale or pant)
'former partner has hot drinks' is the wordplay.
'former partner' becomes 'ex' (an ex-partner).
'has' is a charade indicator (letters next to each other).
'hot' becomes 'h' (abbreviation eg on taps).
'drinks' becomes 'ales' (ale is a kind of drink).
'ex'+'h'+'ales'='EXHALES'
'and' acts as a link.
(Other definitions for exhales that I've seen before include "expires" , "Breathes out" .)