Slight change in RAF, not including first of flights (7)
I believe the answer is:
affront
'slight' is the definition.
(thesaurus)
'change in raf not including first of flights' is the wordplay.
'change in' is an anagram indicator.
'including' means one lot of letters goes inside another.
'first of' indicates taking the first letters.
The initial letter of 'flights' is 'f'.
'raf'+'not'='rafnot'
'rafnot' is an anagram of 'afront'.
'afront' going around 'f' is 'AFFRONT'.
(Other definitions for affront that I've seen before include "Deliberate insult or show of disrespect" , "Offend; offence" , "not trivial offence" , "Cause of outrage or offence" , "provocation" .)