Demanding former partner, single, meeting bloke (7)
I believe the answer is:
exigent
'demanding' is the definition.
('exigent' can be similar in meaning to 'demanding')
'former partner single meeting bloke' is the wordplay.
'former partner' becomes 'ex'.
'single' becomes 'i' (one).
'meeting' means one lot of letters go next to another.
'bloke' becomes 'gent' (I've seen this before).
'ex'+'i'+'gent'='EXIGENT'
(Other definitions for exigent that I've seen before include "Urgent and exacting" , "Pressing; demanding" , "Urgent and taxing" , "Demanding immediate attention" , "Exacting, requiring much" .)