Calming English gang girl that is not without heart (9)
I believe the answer is:
emollient
'calming' is the definition.
(I've seen this before)
'english gang girl that is not without heart' is the wordplay.
'english' becomes 'e' (abbreviation).
'gang girl' becomes 'moll' (I've seen this in other clues).
'that is' becomes 'ie' ('i.e.' can be a synonym of 'that is').
'without heart' means to remove the middle letters.
'not' with its middle removed is 'nt'.
'e'+'moll'+'ie'+'nt'='EMOLLIENT'
(Other definitions for emollient that I've seen before include "Ointment, salve" , "soothing agent" , "Softening, soothing" , "Intended to pacify girl" , "Balm" .)