Soothing time on fell without fellow getting agitated (9)
I believe the answer is:
emollient
'soothing' is the definition.
(thesaurus)
'time on fell without fellow getting agitated' is the wordplay.
'without' indicates named letters should be taken away.
'fellow' becomes 'f' (abbreviation - of a society etc.).
'getting agitated' indicates anagramming the letters.
'time'+'on'+'fell'='timeonfell'
'timeonfell' with 'f' taken away is 'timeonell'.
'timeonell' with letters rearranged gives 'EMOLLIENT'.
(Other definitions for emollient that I've seen before include "Application like a poultice - lemon lite (anag)" , "Conciliatory" , "cream" , "Softening, soothing" , "attempting to avoid confrontation" .)