Quarrelsome culture developing, not without love (9)
I believe the answer is:
truculent
'quarrelsome' is the definition.
(I've seen this before)
'culture developing not without love' is the wordplay.
'developing' indicates an anagram.
'without' is a deletion indicator.
'love' becomes 'o' (In tennis, 'love' means 'zero').
'not' with 'o' removed is 'nt'.
'culture' with letters rearranged gives 'trucule'.
'trucule'+'nt'='TRUCULENT'
(Other definitions for truculent that I've seen before include "Defiant, rude" , "Defiantly aggressive" , "Aggressively defiant" , "Quarrelsome" , "Rude and aggressive" .)